Compare the2025 Audi S3VS 2024 Infiniti Q50

Both the S3 and Q50 have child safety locks to prevent children from opening the rear doors. The S3 has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The Q50’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.

The Audi S3 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 Q50 doesn’t offer knee airbags.

The S3 has a standard Secondary Collision Brake Assist, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The Q50 doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.

To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the S3. But it costs extra on the Q50.

Both the S3 and the Q50 have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, front seatbelt pretensioners, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras and rear cross-path warning.

The S3’s corrosion warranty is 5 years longer than the Q50’s (12 vs. 7 years).

There are over 51 percent more Audi dealers than there are Infiniti dealers, which makes it much easier should you ever need service under the S3’s warranty.

The Audi S3’s engine uses a cast iron block for durability, while the Q50’s engines use an aluminum block. Aluminum engine blocks are much more prone to warp and crack at high temperatures than cast iron.

The S3’s 2.0 turbo 4-cylinder produces 28 more horsepower (328 vs. 300) than the Q50’s standard 3.0 turbo V6.

On the EPA test cycle the S3 gets better mileage than the Q50:

In heavy traffic or at stoplights the S3’s 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. If the conditions warrant or the driver wishes, the system can be manually disabled at any time for the duration of a trip. The Q50 doesn’t offer an automatic engine start/stop system.

To lower fuel costs and make buying fuel easier, the Audi S3 uses regular unleaded gasoline (premium recommended for maximum performance). The Q50 requires premium, which can cost on average about 84.9 cents more per gallon.

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Audi S3 higher (4 out of 10) than the Infiniti Q50 (3). This means the S3 produces up to 11.3 pounds less smog-producing pollutants than the Q50 every 15,000 miles.

The S3 offers a standard sequential manual gearbox (SMG). With no clutch pedal to worry about and a fully automatic mode, an SMG is much more efficient than a conventional automatic but just as easy to drive. The Q50 doesn’t offer an SMG or a conventional manual transmission.

For better stopping power the S3’s brake rotors are larger than those on the Q50:

The S3’s standard tires provide better handling because they have a lower 40 series profile (height to width ratio) that provides a stiffer sidewall than the Q50 Luxe’s standard 50 series tires. The S3’s optional tires have a lower 35 series profile than the Q50 Red Sport 400’s 40 series front tires.

The S3 has standard front and rear gas-charged shocks for better control over choppy roads. The Q50’s suspension doesn’t offer gas-charged shocks.

For better maneuverability, the S3’s turning circle is .2 feet tighter than the Q50’s (36.5 feet vs. 36.7 feet). The S3’s turning circle is .9 feet tighter than the Q50 AWD’s (36.5 feet vs. 37.4 feet).

The Audi S3 may be more efficient, handle and accelerate better because it weighs about 250 to 500 pounds less than the Infiniti Q50.

The S3 is 1 foot shorter than the Q50, making the S3 easier to handle, maneuver and park in tight spaces.

To make loading and unloading groceries and cargo easier, especially for short adults, the S3 has a standard power trunk, which opens and closes automatically by pressing a button, or optionally by just kicking your foot under the back bumper, completely leaving your hands free. The Q50 doesn’t offer a power trunk.

The S3 has a 3500 lbs. towing capacity. The Q50 has no towing capacity.

The S3 Prestige has a standard 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 Q50 doesn’t offer a heads-up display.

The S3’s power parking brake sets with one touch and releases with one touch or automatically. The Q50’s parking brake has to be released manually.

The power windows standard on both the S3 and the Q50 have locks to prevent small children from operating them. When the lock on the S3 is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The Q50 prevents the driver from operating the other windows just as it does the other passengers.

Heated windshield washer nozzles are standard on the S3 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The Q50 doesn’t offer heated windshield washer nozzles.

The Insurance Institute for Highway Safety (IIHS) conducts detailed tests on headlights for their range both straight ahead and in curves and to be certain they don’t exceed acceptable amounts of glare to oncoming drivers. The S3’s headlights were rated “Good” by the IIHS, while the Q50’s headlights are rated “Marginal.”

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The S3 has standard headlight washers to keep headlight output high. The Q50 doesn’t offer headlight washers.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Audi S3 offers an optional wireless phone charging system (Qi) in the front center console. The Q50 doesn’t offer wireless personal charging.

The S3’s Park Assist can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The Q50 doesn’t offer an automated parking system.

Insurance will cost less for the S3 owner. The Complete Car Cost Guide estimates that insurance for the S3 will cost $455 to $7790 less than the Q50 over a five-year period.

The S3 will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the S3 will retain 53.69% to 55.79% of its original price after five years, while the Q50 only retains 45.32% to 45.77%.

The Audi A3/S3/RS 3 outsold the Infiniti Q50 by over two to one during 2023.