Audi S3 vs Mercedes-Benz A35

What's the difference?

There are plenty of historical instances where a particular model within a broader range manages to hit the absolute sweet spot even though it’s not the fastest or most expensive variant. Porsche’s GTS specification across various models is a great example of this.

And at the risk of being proven wrong when the all-new RS3 comes along later this year, this car, the S3, might just pull off that feat.

Yes, the new RS3 will be more powerful and will offer even more grip and sporty flavour, but it will also be more expensive. And we defy anybody to drive the S3 and say that it lacks dynamism in any single area.

It’s also a magnificently balanced car with the right amount of attention paid to every aspect of its trim and performance. That, in essence, is where that `balanced’ label originates and even though it’s felt most in the actual driving experience, it permeates throughout the entire vehicle.

Note: CarsGuide attended this event as a guest of the manufacturer, with travel, accommodation and meals provided.

The Mercedes-AMG A35 sedan is a genuinely fun small car. To me it’s a more mature offering than the A35 hatch, while not being quite as pretentious as a CLA35. Therefore I like it on principle.

Would I personally choose it over an Audi S3? Probably not - but there are plenty of objective reasons why you would.

Perhaps the most striking thing about the styling of the new Audi is just how similar it looks to the old model. Okay, this is not a new thing with Audi which has made a point of not throwing a handsome design into the dumpster in pursuit of new for new’s sake.

As such, the exterior lines are taut and typically Audi clean and, with the latest LED headlights and a refinement of the Audi trapezoidal grille, the look is fresh and crisp without being a novelty act.

Inside, the virtual dash display and large, relatively flat centre console almost amount to anti-styling. Or it would if the rest of the deal wasn’t so sharply angled towards a philosophy of less is more.

Again, this is classic modern-era Audi where the game is to make a complex layout look as simple as possible. The face-level air vents also seem to have borrowed a little Lamborghini (part of the Audi family) DNA.

I particularly like the new shift-by-wire gear selector which is a nifty looking switch but works just as intuitively as a conventional shift lever. New tech meets old muscle memory, I’m calling it.

It's worth mentioning (again) just how good Audi’s customisable dashboard display is. With sharp, clear graphics and the ability for the driver to prioritise the information on display at the time, the S3’s display is still about the best in the business.

Overall, ergonomics have always been a long-suit of this brand and there’s been a clear intention to follow that tradition this time around.

This is the first AMG A-Class sedan ever, so that’s an interesting design decision. I wasn’t sure whether Mercedes needed a CLA ‘Coupe’ and an A-Class sedan to sit alongside one another, but there are distinct differences in terms of the look and intent of the two compact models.

The A sedan carries over the A-Class hatchback’s aggressive styling, with sharp, angular headlights, a strong presence courtesy of its black exterior highlights (including AMG flics on the front bumper and black side skirts, rear spoiler and rear diffuser for this test vehicle). The black 19-inch black-finish rims fitted to our test car are also optional, with silver being the standard finish.

It has a stumpy little boot with a broad stance thanks to its triangulated tail-lights and horizontal reflectors, while the twin exhaust pipes with black tips are rather pleasant to look at, too.

It’s a very attractive sedan, with nothing clumsy about its proportions at all. Is it gorgeous enough to make you think twice about the Audi A3/S3/RS3 as the ruler of the pretty little sedan? Maybe… it’s not quite there for me, although it’s close. But it is certainly a distinct design, one that Merc fans will undoubtedly adore.

The dimensions of the A35 sedan aren’t what a lot of people would actually consider “small”. It’s 4549mm long (on a 2729mm wheelbase), 1796mm wide and 1446mm tall. For context, that’s longer, wider and taller than the substantial Mazda3 small sedan, if not quite as big as the a Corolla sedan.

And if you’re wondering about how that compares to a CLA, that car has the same wheelbase but is 4688mm long, 1830mm wide and 1439mm tall. That’s bigger than a C-Class. Gosh, how confusing. 

What does it all mean when it comes to interior space? Check out the interior images and details below to see for yourself.

While SUV owners are often quick to tell you that they bought their car for its interior space, the truth is sometimes different. And without the huge wheel-wells and suspension towers of a high-riding SUV, the conventional hatch or sedan often has an advantage.

Certainly, there’s no lack of room in the S3 and the hatchback version has a wide hatch opening to make loading easier. The sedan, however, is a full 150mm longer than the hatch and that extra is all behind the rear seat.

So the boot is actually very useable with a capacity of 325 litres. Audi claims the same 325 litres for the Sportback, but that figure jumps to 1145 litres with the rear seat folded flat.

The rear seat in either variant is handily split 40/20/40 and there are storage nets on the back of each front seat, luggage nets in the cargo area and 12-volt outlets in both the centre-rear and luggage compartment. Even floor mats are standard.

I admit, I thought I’d get a bit more in the cabin of the A35 sedan. There’s no electric steering wheel adjustment, no heated steering wheel, and the fact adaptive cruise control is optional (it’s standard on some $25K cars!) is a bit rude, too.

That isn’t to say that it’s not an eye-catching space, one that will hit hard on the bling-o-meter, and will definitely impress anyone who isn’t familiar with Mercedes’ recent cabin design traits.

The twin screens are dazzling - crisp and beautiful to behold, and with graphics that are extremely high resolution. The menus have been designed to be simple, but honestly, it’s a bit confusing until you’re initiated.

Also, I found the media screen to be very glitchy. On multiple occasions it would not respond to touch, and once it even reset itself. I also had several problems connecting to Apple CarPlay. Note: I was using a Mercedes-Benz USB-C adaptor to USB-Lightning cable with an iPhone XS, and I think maybe the adaptor had a part to play in the problems I encountered.

The touchscreen is just one way to interact with the media controls, as there’s a touchpad between the front seats, and the driver has a thumb-controller on the steering wheel to jump between screens. And there’s voice control as well, with the MBUX system’s ‘Hey, Mercedes’ recognition allowing you to ask for things to be adjusted. 

Furthering the wow-factor up front are beautifully designed air vents that light up blue when you turn the temperature down or red when you up the heat. There’s configurable ambient lighting for the cabin, which makes the A35 a bit of a showstopper at night, and our car had the no-cost optional red and black Lugano leather trim, which is either going to be your thing, or not. 

The space for adults up front is decently accommodating, with good headroom and width, plus nice soft touch points where there should be, and there are bottle holders in the doors. There are three USB-C points up front, a pair of cup holders between the seats, and a wireless (Qi) phone charging bay.

The steering wheel is a nice shape and easy to hold, though I’m still not convinced by the little digital displays for the drive-mode dials - they’re toy-like teeny-weeny screens and look a bit pixelated compared to the other displays in the cabin.

Rear seat space is not as good as you might hope or expect, given the size of the car. As a 182cm (6.0ft) man with the driver’s seat set for me, my knees were hard against the seat in front, my toes were squashed and my head was just brushing the headliner, too.

That mightn’t be a problem for you - maybe your only rear seat riders will be short, or young. There are dual ISOFIX child-seat anchor points and three top-tether restraints for baby seats, if that’s the case.

And they’ll be well catered for, with a pair of USB-C ports, as well as directional air-vents, mesh map pockets, and bottle holders in the doors as well as a fold-down armrest with pop out cup holders.

Boot space will likely matter to you if you’re buying a sedan over the hatchback model, and you’ll find an additional 60 litres of boot space here over the five-door model, with 430L of cargo capacity.

That should, in theory, be large enough to fit all three of the CarsGuide cases (124L, 95L, 36L), but the shape of the cargo hold meant I only managed to fit the smallest case with the middle or largest case, but not all three together. Soft luggage could help.

There’s no spare wheel under the boot floor, as the A35 has a tyre repair kit. 

The Mercedes-AMG A35 4Matic sedan has a list price of $72,500, which is the manufacturer’s recommended list price (MRLP, also known as MSRP). That’s the price before on-road costs and extras.

What cars does the A35 compete with? The most obvious rival is one from within, the Mercedes-AMG CLA35, which is $85,500. Then there’s the Audi S3 sedan ($65,800) or RS3 sedan ($86,500). Or the BMW M235i Gran Coupe, which is actually its closest competitor on price, at $72,990. 

You might have made your mind up about wanting the three-pointed-star badge though, so what do you get for your cash when it comes to the A35 sedan?

The standard equipment includes: 19-inch wheels, AMG body kit and 'Night Package' (blacked-out exterior trim), Lugano leather seat trim, heated and electric adjust front seats, keyless entry and push-button start, adaptive AMG Ride Control suspension, AMG drive modes, ambient lighting and a panoramic sunroof.

The cabin is equipped with a pair of 10.25-inch screens - one controlling media via the brand’s MBUX system and featuring Apple CarPlay and Android Auto, and the other a configurable display for driver info. There’s sat nav, five USB-C ports, wireless phone charging, and a nine-speaker sound system.

Other features include an auto-dimming rearview mirror, LED headlights and daytime running lights, semi-autonomous parking, front and rear parking sensors, a reversing camera and a number of active safety items beyond that. See the safety section below for more info.

Our car had a couple of options, including: black-finish 19-inch alloy wheels ($790); the 'Driving Assistance Package' - incorporating adaptive cruise control with front and rear cross-traffic alert, active lane-change assist, and 'Route-Based Speed Adaptation' - more on that below ($1890); the 'Vision Package' - with 'Multibeam LED' headlights and selective adaptive high beam assist, and a 360-degree surround view camera ($990); and the 'AMG Aerodynamics Package' - with front flics, side skirt trims, rear spoiler and rear diffuser ($2490).

All told, the as-tested price for this car was $78,660 plus on-roads.

Here’s where a lot of the extra currency demanded for the S3 goes. Forget the 1.5-litre engine in the base-model A3, and instead move to the two-litre four-cylinder as seen in the A4 40 TFSI. Then, add extra turbo-boost (up to 1.8 bar thanks to an efficient intercooler) different variable valve timing protocols, and a direct fuel-injection system with a specific calibration and the potential to create injector pressures of up to 350 bar, and you have the S3’s powerplant.

Maximum power is 228kW at anywhere from 5450 to 6500rpm, and maximum torque of 400Nm produced in a broad range between 2000 and 5450rpm.

Transmission is a seven-speed dual-clutch unit driving through all four wheels as per Audi’s Quattro mantra, although it’s important to note this version of Quattro is the simpler, arguably less pure, on-demand system where the car behaves as a front-drive platform until the all-wheel-drive system is required to step in.

That said, with 228kW under its wheels, that’s a fair bit of the time. And compared with previous systems, this one takes more notice of driver inputs and wheel-speed to be less reactive and more active.

You could look at this one of two ways: 1) this is the least powerful AMG on sale today; 2) this is a seriously powerful small car.

If you’re glass-half-full-biased like me, you’ll see the engine specs and park yourself in the latter camp. 

There’s a 2.0-litre turbocharged four-cylinder petrol motor which isn’t short on horsepower: it has 225kW of power and 400Nm of torque - those were class-killing power outputs not too long ago. 

The grunt numbers give the AMG A35 sedan a claimed 0-100km/h time of just 4.8 seconds, while the top speed is limited to 250km/h. Five years ago these power figures and performance numbers would have pegged the A35 in A45 territory - this is a seriously powerful little jigger.

The engine is teamed to a seven-speed dual-clutch automatic transmission, and the A35 runs Benz’s 4Matic all-wheel drive system, which is front-biased but can shuffle torque 50:50 if needed. 

Audi quotes an official combined cycle fuel consumption figure of 7.4L/100km for the A3 Sportback and 7.3 litres for the sedan.

That difference is a bit of a mystery given the sedan is heavier (by just five kilograms) until you consider that the combined figure includes freeway running, at which point the sedan’s extra 150mm of length and different rear diffuser may be the aerodynamic deal-breaker.

The Sportback emits 170 grams of CO2 per kilometre (166 for the sedan) and with the 55-litre tank fitted, both variants should have a range of around 750km between fill-ups.

The combined cycle fuel consumption figure - that’s what the brand says the car will use over a mix of driving - is 7.4 litres per 100 kilometres.

I saw a little higher than that over my 650km of driving, which was heavily biased towards highway testing, but also included a few traffic snarls and a couple of stints of performance testing. I saw 8.4L/100km, which is okay, but I expected better given 80 per cent of my time in the car was in easy-going open road driving.

The fuel tank capacity for the A35 sedan is 51 litres, and you’ll need to fill it with 98 RON premium unleaded petrol. 

Some cars take a few minutes at the wheel before they start to get chatty. Not so the S3. From the moment you grab the lovely leather tiller, haul it into gear and give the perky little turbo-motor a squeeze on the throttle, the Audi is making all the right noises and giving clear, precise feedback on its every move.

Sometimes, cars with lots of tyre, lots of all-wheel drive grip and the sort of sharp steering fitted here, can start to feed back so many responses that it becomes difficult to know which one to respond to.

Not the S3, which seems tuned to a keener driver’s priorities (as it should be, of course). As a result, the steering feedback is distinct from what the rest of the front end is doing and everything else going on is clear, quantifiable and designed to improve the experience.

That even extends to the soundtrack which, Audi told us does not use any electronics to improve it beyond amplifying the engine-bay harmonics which use the windscreen and scuttle as their 'speaker.'

Combined with the active exhaust system, this car honestly sounds like a five-cylinder engine (I opened the bonnet to count the spark plugs to make sure it wasn’t. It isn’t.)

If you’ve ever driven a five-cylinder Audi or a V10-powered R8 (two in-line fives, really) the tune will be a familiar one. Lovely, and – again - such amazing attention to detail.

The 2.0-litre engine runs fairly high boost levels, but that doesn’t seem to have affected the way it storms off the mark. Neither does the dual-clutch transmission contribute any delay, provided you haven’t managed to stand on the brake and throttle at the same time (as many left-foot brakers might).

At that point, the driveline goes into sulk mode and will force you to wait a heartbeat or two before full power is restored. This can be an issue when trying to dart across a busy intersection or merge into a traffic flow.

It’s not a new thing to Audis, but remains an annoyance to those of us who equate having two pedals with having two feet.

The driver-selectable drive modes fitted to the S3 are interesting inasmuch as they actually make a meaningful difference to the way the car operates. They alter the transmission shift points, the throttle sensitivity, steering weight and damper settings.

'Comfort' mode will be the default for most owners, and while 'Dynamic' does sharpen up the dampers ever-so-slightly beyond an acceptable day-to-day level of firmness, it also adds weight to the steering feedback.

Frankly, I don’t think it needs it and simply adding resistance feels like a token gesture. And since the steering has a (non-negotiable) variable rate in the first place, bigger inputs equal a bigger proportionate change of direction anyway.

The damping control is now the more sophisticated magnetic-hydraulic type where hydraulic pressure varies the valving rather than the simpler, previous system of energising an electro-magnet to alter the viscosity of the damping fluid.

This more finite control system has allowed more 'bandwidth' as Audi puts it, between Comfort and Dynamic damper settings.

While the auto mode is almost prescient, it’s not actually pre-emptive but rather takes into account suspension deflection, wheel-speed and driver inputs to come up with a combination of settings to make the most of the situation.

And if you really want to fiddle, you can choose 'Individual' and create an overall setting that combines bits of Comfort and Dynamic with a smattering of 'Efficiency' thrown in.

Toggle down to Dynamic and throw the S3 at some bends and it soon emerges as a pretty gripped-up piece of equipment. The front-drive bias is not really noticeable, but then neither is the transition where the computer begins to engage the rear multi-plate clutch to turn the rear axle into an active participant.

There’s certainly no lack of grip at any stage of a typical corner, and even the odd unexpected damp patch poses no awkward questions. Perhaps the biggest grumble would be the tyre roar at highway speeds, but that’s often the price of performance rubber.

On paper this seems like the ideal option for those who know they’ll never really be able to take advantage of the outputs of an A45 or CLA45’s ludicrous power and torque figures.

In practice? It mostly lives up to that notion - though just like an A45 or CLA45, you’re going to enjoy it a lot more when you’re giving it the beans. 

Driving with intent, the engine and transmission work together amazingly well. The transmission itself is thoughtful and smart shifting, swapping cogs exactly when you think it should - while you have paddle shifters available to use, in most cases you’re not going to need them.

The engine itself is an absolute weapon. There’s lots and lots of pulling power, it’s linear in the way it delivers its power, and there’s a little bit of pop and crackle from the exhaust - personally, I would like even more. I guess that’s where an A45 or CLA45 comes into its own.

The steering is superb for an all-wheel drive car, too. It’s direct and accurate, and while you can feel the electronics shuffling the power and torque between front and rear axles it’s a really nicely balanced and very easy car to drive fast – at times even faster than you really should be. 

In Sport mode and Sport Plus mode the suspension and steering are tightened up, with taut responses but the suspension is never crunchy or uncomfortable. Braking performance is very good, too.

In Comfort mode though, I struggled to come to terms with the A35 a little. In my mind, it lived up to the notion of a sporty sedan a lot more readily than it did that of a compact luxury sedan. It just feels like it’s meant to be on a twisty road, not dealing with daily drudgery in commuting.

One not-very-luxurious element was the road noise intrusion, which was the worst of any new car I can recall experiencing. That might seem a dramatic claim, but the booming tyre roar on coarse chip road surfaces, including major Sydney freeways, was verging on unbearable. I measured it on my smartphone, and 78 decibels was the maximum readout.

And while very impressive under pressure, the powertrain is somewhat doughy in less demanding situations. There’s some lag to contend with, and a little bit of lunging from the transmission, too. However, it was during downshifts that I found the transmission’s behaviour most questionable, with some shift-shunts when slowing to a halt in urban driving. 

One unexpected finding was the 'Route-Based Speed Adaptation' system’s behaviour, which was active in the car I was driving. The tech uses the car’s mapped position to guide its adaptive cruise control behaviour. In theory it’s a very smart idea - the car will slow itself down if it predicts you’re about to approach a tight bend and you’ve got it set at the speed limit. Or if you’re approaching a roundabout, it’ll think ahead, too.

But during my time in the car, I had an issue that I found could be potentially dangerous. Having set the speed at 80km/h in a relatively new tunnel in Sydney’s west (the WestConnex M4, opened July, 2019), the system couldn’t place the car’s location, which meant the car believed it was still on surface streets. 

On multiple occasions the car slowed dramatically thinking I needed to turn a corner that didn’t exist on the road I was driving on. My instant thought was: “What if the person behind me wasn’t looking at the road ahead?” I’ve seen enough drivers with their eyes aimed at the phone in their lap and not the road ahead, to know this is a distinct possibility.

There’s also a risk from tailgating trucks, which seem to be more prevalent in Sydney’s west than anywhere else on the planet. It’s a potential risk, even if the Benz has clever tech that can flash the tail-lights if the car’s systems predict there’s a chance of being rear-ended.

Mercedes-Benz’s Aussie team let me know that the map software wasn’t up to date, which is why the car didn’t understand the situation. It’s technology you can disable by simply delving into the menus on the MBUX system, but I’d recommend you try it out to see if you’re comfortable with it.

The A-Class range was awarded the full five-star ANCAP crash test rating based on 2018 criteria, and the scoring measures have progressed since then. According to ANCAP, the rating applies to all Mercedes Benz A-Class variants, though the Mercedes-AMG A35 (hatch and sedan) and A45 (hatch) are not shown on the scorecard.

However, the entire A-Class range comes with auto emergency braking (AEB) that operates between 7-200km/h and has pedestrian and cyclist detection (7-50km/h), active lane keep assist (LKAS, 0-250km/h) and lane departure warning (LDW), traffic sign recognition (TSR), and blind spot monitoring (BSM) and rear cross traffic alert (RCTA) with auto-braking. There’s also driver fatigue monitoring, cruise control with speed limiter, and speed sign recognition.

But despite being the top-of-the-range A-Class sedan, you still have to pay extra for the safety of front cross traffic alert with braking, and the brand’s Distronic adaptive cruise control system. Those are part of the Driving Assistance Package ($1890), which also incorporates active blind spot assist, active lane change assist, a system called Evasive Steering Assist (which sharpens up the steering to be more direct if a crash threat is predicted), and the aforementioned Route-Based Speed Adaptation.

Audi has finally had to cave in and extend its warranty to match its competition. So, any new Audi sold after January 1 this year moves up to a five-year/unlimited kilometre factory warranty; a big step up from the previous three years of cover.

S3 buyers can also opt for Audi’s five-year service plan which costs $2580. Servicing is set down for every 15,000km or 12 months.

Mercedes-Benz Australia recently joined Korean luxury brand Genesis in meeting the market with a five-year/unlimited kilometre warranty plan for all of its models, including AMG variants.

Service intervals for the A35 sedan are set every 12 months/25,000km - yes, that’s a generous maintenance schedule, as most cars require servicing every 15,000km. 

Buyers can opt to pre-pay servicing costs and roll it into their finance package, and there’s a level of discount applied if you do that. 

For a three-year/75,000km service plan, you’ll pay $2150, saving you $500 over pay-as-you-go capped price servicing. There’s also a four-year/100,000km plan ($2950) or a five-year/125,000km plan ($4000). That’s surprisingly decent for a luxury car, though keep in mind it doesn’t include wiper inserts or brake pads/discs.

Buyers get roadside assistance included for the duration of the new-car warranty, too.