Infiniti QX30 vs Mercedes-Benz GLA250

What's the difference?

Even though it’s almost identical to the Q30, the QX30 manages to feel sufficiently different in suspension tune and cabin ambiance to be considered different.

It’s a disappointing oversight, though, by Infiniti to deny the base GT such basic safety fundamentals as a rear view camera (which Infiniti assures us is being worked on).

My wonderful wife, who is not really into this kind of car, admitted to me in a quiet voice that she really liked the GLA45 as long as it was in Sport + mode. And I have to agree. While I'm very fond of the ridiculous Audi RSQ3 (that turbo five-cylinder sounds amazing), I think I'd stump up the extra for the GLA.

Importantly, it can be comfortable, it can be quiet and it's a better fit for most humans than the A or CLA. It is getting on a bit and could do with a further clean-out of the poor ergonomics, but in what is likely its final year on sale, it's still a belter.

The QX30 is one of the first projects to result from a technology partnership formed between the parent company of Mercedes-Benz and the Nissan-Renault Alliance.

In a sign of how worldly the car industry is becoming, the QX30 is built in Nissan’s Sunderland plant in the UK, using the German Mercedes-Benz A-Class platform and powertrains, all under Sino-French ownership via the Nissan-Renault Alliance.

On the outside, the design that first aired on the Q30 is pretty unique. It’s not a subtle car, with deep crease lines along its sides that, according to Infiniti, is an industry first in terms of manufacturing complexity.

When it comes to differences between the two vehicles, it’s minimal at best. There is a 35mm increase in height (30mm from taller springs and 5mm from roof rails), an extra 10mm in width, and extra trims affixed to the front and rear bumpers. Aside from the all-wheel-drive underpinnings, that is pretty much it for the exterior.

The same black plastic overfenders that are fitted to the Q30 are present on the QX30, with 18-inch rims on both the base model GT and the other variant, the Premium.

The dimensions of the QX30 are also an exact match for those on the Mercedes-Benz GLA, with the long front overhang acting as the main visual connection between the two cars.

The GLA45 isn't a looker, but then, none of the GLAs are. There's a certain blobbiness to it. A bit of Teletubby mixed with...um, another Teletubby. It's not ugly, it's just not particularly attractive. The 20-inch wheels do much to lift the appearance and negate the effect of the raised ride height compared to the A45/CLA45.

The body kit stops just short of lairy, which is heartening. So if you want to stand out, venture out into the aftermarket world.

Inside was a mild surprise. The last time I drove a CLA 45 I used the word "gaudy". While the GLA isn't amazingly better, the texture of the Alcantara replacing the brushed metal-look plastic, or the carbon of the option pack, was much more pleasant. The brightwork in the cabin is still a bit odd looking, and it's still overcooked with its red detailing, but it is an otherwise beautifully built and well-detailed interior.

The QX30 is obviously very similar to the Q30 in many respects, but the interior is slightly different, with larger, less cosseting seats up front and slightly higher seats in the rear.

The cabin is also lighter in overall appearance, thanks to a paler colour palette.

There are plenty of neat inclusions, including a pair of USB ports, plenty of door storage, a space for six bottles and a sizable glove box.

A pair of cupholders resides up front, along with a pair in the fold-down armrest in the rear.

There is no particularly logical location for the storage of smartphones, though, and the lack of Apple CarPlay or Android Auto is down to Infiniti opting for its own phone connectivity suite.

A decent 430 litres of luggage space behind the rear seats is contrasted by a cramped rear area for all but the smallest of passengers, while sharply shaped rear door apertures making getting in and out a bit of an ask.

There are two ISOFIX baby seat points and a 12-volt socket in the rear, as well.

The front seats are utterly brilliant and feel as good as they look. On first acquaintance they may feel under-padded, but once you've adjusted them to your liking, you never want to leave. The AMG cars also feature one vast improvement over a normal GLA - the ergonomic disaster of a column-mounted shifter is removed, with a console-mounted shifter added where a small cubby once lived. It's so much better, although the Park button is oddly difficult to press.

When luxuriating in those snug front seats, you'll have access to two cupholders and door-mounted bottle holders, as well as a console bin (where the USB ports are) and a tray under the climate controls. Rear seat passengers will find legroom tight but headroom good, even with the huge sunroof.

The GLA's boot holds an entirely reasonable 421 litres, rising to 1235 when you drop both rear seats.

The GLA 45 lightens your wallet by no less than $89,211 - more than double the GLA 180 front-wheel drive, and about $5000 more than the bonkers (and ancient) RS Q3.

Packed into the GLA's kit bag are 20-inch alloy wheels, a 12-speaker stereo, dual-zone climate control, comprehensive safety gear, reversing camera, keyless entry and start, front and rear parking sensors, electric and heated front seats, sat nav, auto LED headlights, auto wipers, leather trim (some real, some not), auto parking, powered and heated folding mirrors, a massive sunroof and dynamic dampers. There's no spare tyre, just a tyre-repair kit.

The multimedia system is Mercedes' COMAND unit and it is as user-unfriendly as ever. It does, however, power a very decent stereo, and also offers Apple CarPlay and Android Auto.

Thankfully our car was bereft of both the carbon-fibre package ($990) and the aerodynamics package ($1990).

Just the one engine is used across both cars; the 155kW/350Nm single-turbo 2.0-litre four-cylinder petrol engine from the Q30 and A-Class.

It’s backed by a seven-speed transmission and wired into an all-wheel-drive system that is biased towards a front-drive configuration.

Sourced from Mercedes-Benz, up to 50 per cent of drive can be sent to the rear wheels, according to Infiniti.

AMG's fabled 2.0-litre turbo four lurks under that higher bonnet, still kicking out an improbable 280kW and 475Nm. Drive reaches the road via Merc's own seven-speed twin-clutch transmission and all four of its wheels.

All that power and grip translates to a 4.4-second dash to 100km/h for the slightly tubby (over 1600kg) GLA, but just between you and me, anything under five seconds feels scorchingly quick.

Infiniti claims a combined fuel economy figure of 8.9L/100km for the 1576kg QX30 across both the variants; this is 0.5L thirstier than the Q30 version.

Our brief test yielded a dash figure of 11.2L/100km over 150km.

The official combined-cycle figure suggests the GLA45 will consume 7.5L/100km. Obviously that figure is largely irrelevant, and not just for the usual reasons, but because you don't buy a GLA45 to potter about in. I got, uh, 12.5L/100km, so you can imagine how much I was enjoying it.

As you might expect, you'll need to feed it 98RON.

Again, it would be easy to think that the QX30 would feel almost identical to its lower-riding sibling – but that would be incorrect. We criticised the Q30 for being a bit too buttoned down and unresponsive, but the QX30 feels more lively and involving, thanks to its unique spring and damper set-up.

Even though it’s 30mm higher than the Q, the QX doesn’t feel it at all, with a benign, pleasant ride with good body roll control and competent steering.

Our front-seat passenger complained of feeling a little ‘hemmed in’, which is a valid point. The sides of the car are very high, and the roofline is quite low, exacerbated by the steeply raked windscreen.

The 2.0-litre four-potter is smooth and punchy, and the gearbox well suited to it, but it’s lacking in aural character. Luckily the QX30 does a terrific job of suppressing noise before it gets into the cabin, then…

When the 45-badged cars first launched, they were something of a revelation. BMW's turbo six-cylinder fans sniffed at the 2.0-litre's staggering outputs and all-wheel-drive chassis, but this car really captured the imagination. The GLA45 might be slightly unexpected, but it's better in almost every way as a daily driver than the A or CLA.

For a start, its higher ride height seems to translate to a much better ride quality. Anything on 20-inch wheels should have an appalling ride, but the GLA45 manages to be firm yet comfortable. Put the other two in Race mode and you'll need to up your private health insurance extras to include osteo, physio and whatever "o"-ending specialist fixes your back.

The improved ride quality meant I was far happier to chuck this car around. While it doesn't have the same ultimate overall performance of the lower cars, it's far more comfortable whether you're on it or just driving around. The front seats are supportive and comfortable, and the steering is excellent.

As for the engine...well, it still farts like toddler during a moment of silence at a funeral, but you can't deny its technical brilliance and huge power outputs. I remember the CLA45's engine as being a bit highly strung. Perhaps I couldn't separate the overall high-strung nature of the car from the engine, but I felt the same engine in this car wasn't as jumpy.

The way it propels this car into triple figures is tremendous fun. It's not as charismatic as the Audi five-cylinder, perhaps, but that doesn't matter in the end - it's properly fast, attached to a better chassis and offers a cabin with a driving position fit for humans.

The GLA comes with nine airbags (including driver's knee), blind-spot sensors, lane-departure warning, lane-keep assist, forward-collision warning and mitigation and driver-attention detection.

The GLA does not have its own ANCAP rating, but the A-Class on which it is so heavily-based scored five stars in 2013.

The Q30 is offered with a four-year, 100,000km warranty, and servicing is suggested every 12 months or 25,000km.

Infiniti offers a fixed three-year service schedule, with the GT and the Premium both costing an average of $541 over the three services provided.

The Mercedes standard warranty is three years/unlimited kilometres with roadside assist to match. Service intervals are a very reasonable 12 months/20,000km.

The company also offers capped-price servicing - first service is $576 but the second and third are a whopping $1152 each. Three years will set you back $2880.