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The GLS’ pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The Ascent doesn’t offer pre-crash pretensioners.
The GLS has a standard Surround View System to allow the driver to see objects all around the vehicle on a screen. The Ascent only offers a rear monitor and rear parking sensors that beep or flash a light. That doesn’t help with obstacles to the front or sides.
The GLS’ driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The Ascent doesn’t offer a driver alert monitor.
Both the GLS and the Ascent have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, height adjustable front shoulder belts, four-wheel antilock brakes, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras and available lane departure warning systems.
The Mercedes GLS weighs 1098 to 1271 pounds more than the Subaru Ascent. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.
The GLS comes with a full 4-year/50,000-mile basic warranty, which covers the entire truck and includes 24-hour roadside assistance. The Ascent’s 3-year/36,000-mile basic warranty expires 1 year and 14,000 miles sooner.
J.D. Power and Associates’ 2019 Initial Quality Study of new car owners surveyed provide the statistics that show that Mercedes vehicles are better in initial quality than Subaru vehicles. J.D. Power ranks Mercedes 12th in initial quality. With 19 more problems per 100 vehicles, Subaru is ranked 25th.
J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Mercedes vehicles are more reliable than Subaru vehicles. J.D. Power ranks Mercedes 13th in reliability, above the industry average. With 2 more problems per 100 vehicles, Subaru is ranked 14th.
The GLS 450’s standard 3.0 turbo 6 cyl. hybrid produces 102 more horsepower (362 vs. 260) and 92 lbs.-ft. more torque (369 vs. 277) than the Ascent’s 2.4 turbo 4 cyl. The GLS 580’s standard 4.0 turbo V8 hybrid produces 223 more horsepower (483 vs. 260) and 239 lbs.-ft. more torque (516 vs. 277) than the Ascent’s 2.4 turbo 4 cyl.
Regenerative brakes improve the GLS’ fuel efficiency by converting inertia back into energy instead of wasting it. The Ascent doesn’t offer a regenerative braking system.
In heavy traffic or at stoplights the GLS’ engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. (Start/Stop isn’t accounted in present EPA fuel mileage tests.) The Ascent doesn’t offer an automatic engine start/stop system.
The GLS has 4.5 gallons more fuel capacity than the Ascent (23.8 vs. 19.3 gallons), for longer range between fill-ups.
In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes GLS higher (6 out of 10) than the Subaru Ascent (3). This means the GLS produces up to 23.4 pounds less smog-producing pollutants than the Ascent every 15,000 miles.
For better stopping power the GLS’ brake rotors are larger than those on the Ascent:
For better traction, the GLS has larger tires than the Ascent (255/50R19 vs. 245/60R18).
The GLS’ tires provide better handling because they have a lower 50 series profile (height to width ratio) that provides a stiffer sidewall than the Ascent’s standard 60 series tires.
For better ride, handling and brake cooling the GLS has standard 19-inch wheels. Smaller 18-inch wheels are standard on the Ascent. The GLS’ optional 23-inch wheels are larger than the 20-inch wheels on the Ascent Limited/Touring.
The front and rear suspension of the GLS uses air springs for a smoother, controlled ride than the Ascent, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.
The GLS offers an available adjustable active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Subaru doesn’t offer an active suspension on the Ascent.
The GLS has a standard driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads or off-road. The Ascent’s suspension doesn’t offer adjustable shock absorbers.
The GLS has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The GLS’ height leveling suspension allows the driver to raise ride height for better off-road clearance and then lower it again for easier entering and exiting and better on-road handling. The Ascent doesn’t offer a load leveling suspension.
The GLS has vehicle speed sensitive variable-assist power steering, for low-effort parking, better control at highway speeds and during hard cornering, and a better feel of the road. The Ascent doesn’t offer variable-assist power steering.
The GLS’ drift compensation steering can automatically compensate for road conditions which would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The Ascent doesn’t offer drift compensation steering.
For a smoother ride and more stable handling, the GLS’ wheelbase is 9.6 inches longer than on the Ascent (123.4 inches vs. 113.8 inches).
For better handling and stability, the track (width between the wheels) on the GLS is 1.3 inches wider in the front and 2.4 inches wider in the rear than on the Ascent.
For greater off-road capability the GLS has a 1.4 inches greater minimum ground clearance than the Ascent (10.1 vs. 8.7 inches), allowing the GLS to travel over rougher terrain without being stopped or damaged. The GLS Off-Road Package’s minimum ground clearance is 2.6 inches higher than on the Ascent (11.3 vs. 8.7 inches).
The GLS has .2 inches more rear headroom, 3.3 inches more rear legroom and 2.9 inches more third row legroom than the Ascent.
The GLS has a standard third row seat which folds flat into the floor. This completely clears a very large cargo area quickly. The Ascent doesn’t offer seats that fold into the floor.
Pressing a switch automatically lowers or raises the GLS’ second and third row seats, to make changing between cargo and passengers easier. The Ascent doesn’t offer automatic folding seats.
To make loading groceries and cargo easier when your hands are full, the GLS’ cargo door can be opened and closed just by kicking your foot under the back bumper, leaving your hands completely free. The Ascent doesn’t offer a hands-free gesture to open its liftgate, forcing you to put cargo down if your hands are full.
The GLS’ standard towing capacity is much higher than the Ascent’s (7700 vs. 2000 pounds).
The GLS uses gas struts to support the hood for easier service access. The Ascent uses a prop rod to support its heavy hood. It takes two hands to open the hood and set the prop rod, the prop rod gets in the way during maintenance and service, and the prop rod could be knocked out, causing the heavy hood to fall on the person maintaining or servicing the car.
J.D. Power and Associates surveys of service recipients show that Mercedes service is better than Subaru. J.D. Power ranks Mercedes fifth in service department satisfaction. With a 41% lower rating, Subaru is ranked 19th.
Unlike the driver-only memory seat in the Ascent Limited/Touring, the GLS has standard driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position, suspension setting, power steering assist, outside mirror angle, climate settings and radio stations and the front passenger seat also adjusts to the new passenger’s preset preferences.
The GLS’ standard easy entry system raises the steering wheel and glides the driver’s seat back, making it easier for the driver to get in and out. The Ascent doesn’t offer an easy entry system.
The GLS offers an optional heads-up display that projects speed and navigation instruction readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The Ascent doesn’t offer a heads-up display.
The power windows standard on both the GLS and the Ascent have locks to prevent small children from operating them. When the lock on the GLS is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The Ascent prevents the driver from operating the other windows just as it does the other passengers.
The GLS’ front and rear power windows all open or close fully with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside the car. The Ascent’s rear power window switches have to be held the entire time to open or close them fully.
If the windows are left open on the GLS the driver can close them all at the outside door handle or from a distance using the remote. On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the Ascent can only operate the windows from inside the vehicle, with the ignition on.
The GLS’ rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The Ascent’s standard manually variable intermittent wipers have to be constantly adjusted.
When the GLS is put in reverse, the passenger rearview mirror tilts from its original position. This gives the driver a better view of the curb during parallel parking maneuvers. Shifting out of reverse puts the mirror into its original position. The Ascent’s mirror doesn’t automatically adjust for backing.
The GLS has standard automatic dimming rear and side view mirrors which automatically darken quickly when headlights shine on them, keeping following vehicles from blinding or distracting the driver. The Ascent offers an automatic rear view mirror, but its side mirrors don’t dim.
The GLS has standard heated front and optional heated second and third row seats, which keep the driver and passengers extremely comfortable in the winter. Subaru doesn’t offer heated seats in the third row of the Ascent.
Optional air conditioned the front and second row seats keep the GLS’ passengers comfortable and take the sting out of hot leather in summer. The Ascent doesn’t offer air-conditioned seats for the second row.
The GLS offers optional massaging front and second row seats, which keep the driver and middle row passengers. Massaging seats aren’t available in the Ascent.
To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Mercedes GLS has a standard wireless phone charging system (Qi) in the center console and for the rear passengers. The Ascent doesn’t offer wireless personal charging.
The GLS’ Active Parking Assist can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. The Ascent doesn’t offer an automated parking system.
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