Compare the2025 Acura RDXVS 2024 Mercedes AMG GLB

The Acura RDX has standard driver and front passenger side knee airbags mounted low on the dashboard. These airbags helps prevent the driver and front passenger from sliding under their seatbelts or the main frontal airbags; this keeps them better positioned during a collision for maximum protection. Knee airbags also help keep the legs from striking the dashboard, preventing knee and leg injuries in the case of a serious frontal collision. The AMG GLB doesn’t offer a front passenger side knee airbag.

The RDX’s standard lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane and gently nudges the vehicle back towards its lane. A lane departure warning system costs extra on the AMG GLB.

Both the RDX and the AMG GLB have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front 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, blind spot warning systems, rearview cameras, rear cross-path warning and available around view monitors.

The Acura RDX achieved a “Top Safety Pick” rating from the Insurance Institute for Highway Safety (IIHS) for the 2024 model year. This recognition was based on its impressive performance in the small overlap frontal crash test, updated side impact crash test, headlight evaluations, and pedestrian crash prevention testing. The AMG GLB has not yet been evaluated by the IIHS for 2024.

Acura’s powertrain warranty covers the RDX 2 years and 20,000 miles longer than Mercedes covers the AMG GLB. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 6 years or 70,000 miles. Coverage on the AMG GLB ends after only 4 years or 50,000 miles.

A reliable vehicle saves its owner time, money and trouble. Nobody wants to be stranded or have to be without a vehicle while it’s being repaired. Consumer Reports rates the RDX’s reliability 50 points higher than the AMG GLB.

J.D. Power and Associates’ 2024 Initial Quality Study of new car owners surveyed provide the statistics that show that Acura vehicles are better in initial quality than Mercedes vehicles. J.D. Power ranks Acura above average in initial quality. With 13 more problems per 100 vehicles, Mercedes is rated below average.

J.D. Power and Associates’ 2024 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Acura vehicles are more reliable than Mercedes With 2 fewer problems per 100 vehicles in the first three years of ownership, J.D. Power ranks Acura higher than Mercedes.

From surveys of all its subscribers, Consumer Reports’ January 2024 Auto Issue reports that Acura vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Acura fourth in overall reliability. Mercedes is ranked 29th.

On the EPA test cycle the RDX gets better fuel mileage than the AMG GLB 35 (21 city/27 hwy vs. 21 city/26 hwy).

To lower fuel costs and make buying fuel easier, the Acura RDX uses regular unleaded gasoline (premium recommended for maximum performance). The AMG GLB requires premium, which can cost on average about 84.9 cents more per gallon.

The RDX has 3.6 gallons more fuel capacity than the AMG GLB (17.1 vs. 13.5 gallons), for longer range between fill-ups.

The RDX has a standard cap-less fueling system. The fuel filler is automatically opened when the fuel nozzle is inserted and automatically closed when it’s removed. This eliminates the need to unscrew and replace the cap and it reduces fuel evaporation, which causes pollution. The AMG GLB doesn’t offer a cap-less fueling system.

A 10-speed automatic is standard on the Acura RDX, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the AMG GLB.

The RDX has a standard easy tire fill system. When inflating the tires, the vehicle’s integrated tire pressure sensors keep track of the pressure as the tires fill and tell the driver when the tires are inflated to the proper pressure. The AMG GLB doesn’t offer vehicle monitored tire inflation.

The RDX has a standard space-saver spare (not available on A-Spec) so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the AMG GLB; it requires you to depend on its run-flat tires, which limits mileage and speed before they are repaired. If a run-flat is damaged beyond repair by a road hazard your vehicle will have to be towed. Some tire options on the AMG GLB don’t have a run-flat feature, either.

For better handling and stability, the track (width between the wheels) on the RDX is .5 inches wider in the front and 1.9 inches wider in the rear than on the AMG GLB.

For better maneuverability, the RDX’s turning circle is 2.1 feet tighter than the AMG GLB’s (38.9 feet vs. 41 feet).

The RDX uses computer-generated active noise cancellation to help remove annoying noise and vibration from the passenger compartment, especially at low frequencies. The AMG GLB doesn’t offer active noise cancellation.

The RDX has .5 inches more front legroom, 3.8 inches more front shoulder room, .3 inches more rear legroom and 1.7 inches more rear shoulder room than the AMG GLB.

The RDX has a much larger cargo volume with its rear seat up than the AMG GLB with its rear seat up (31.1 vs. 12.4 cubic feet). The RDX has a much larger cargo volume with its rear seat folded than the AMG GLB with its rear seat folded (79.8 vs. 62 cubic feet).

Pulling a handle automatically lowers the RDX’s rear seats, to make changing between passengers and cargo easier. The AMG GLB doesn’t offer automatic folding seats.

The RDX has a 1500 lbs. towing capacity. The AMG GLB has no towing capacity.

J.D. Power and Associates surveys of service recipients show that Acura service is better than Mercedes. J.D. Power ranks Acura 9th in service department satisfaction (above the industry average). With a 12% lower rating, Mercedes is ranked 17th.

To improve rear visibility by keeping the rear window clear, the RDX has a standard rear fixed intermittent wiper with a full on position. The rear wiper standard on the AMG GLB only has an intermittent setting, so in a hard rain visibility isn’t as good.

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the RDX has standard extendable sun visors. The AMG GLB doesn’t offer extendable visors.

Both the RDX and the AMG GLB have standard heated front seats. The RDX Advance also has standard heated rear seats to keep those passengers extremely comfortable in the winter. Heated second row seats aren’t available in the AMG GLB.

Insurance will cost less for the RDX owner. The Complete Car Cost Guide estimates that insurance for the RDX will cost $3375 to $3685 less than the AMG GLB over a five-year period.

IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the Acura RDX will be $6062 to $13157 less than for the Mercedes AMG GLB.

The Acura RDX has won recognition from these important consumer publications:

The Acura RDX outsold the Mercedes GLB by over two to one during 2023.