Compare the2025 Audi A3VS 2024 Mercedes CLA

For enhanced safety, the front seat shoulder belts of the Audi A3 are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The Mercedes CLA doesn’t offer height-adjustable seat belts.

Both the A3 and CLA have child safety locks to prevent children from opening the rear doors. The A3 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 CLA’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 A3 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 CLA 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.

Over 200 people are killed each year when backed over by motor vehicles. The A3 has standard backup collision prevention system that uses rear sensors to monitor for objects to the rear and automatically applies the brakes to prevent a collision. The CLA doesn’t offer automatic braking for stationary objects directly to the rear.

To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the A3. But it costs extra on the CLA.

The A3’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 CLA.

Both the A3 and the CLA have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available blind spot warning systems, rear parking sensors and rear cross-path warning.

The A3’s corrosion warranty is 7 years longer than the CLA’s (12 vs. 5 years).

The Audi A3’s engine uses a cast iron block for durability, while the CLA’s engine uses an aluminum block. Aluminum engine blocks are much more prone to warp and crack at high temperatures than cast iron.

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 A3’s reliability 25 points higher than the CLA.

From surveys of all its subscribers, Consumer Reports’ January 2024 Auto Issue reports that Audi vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Audi 10 places higher in reliability than Mercedes.

To lower fuel costs and make buying fuel easier, the Audi A3 uses regular unleaded gasoline (premium recommended for maximum performance). The CLA requires premium, which can cost on average about 84.9 cents more per gallon.

The A3 has a gallon more fuel capacity than the CLA (14.5 vs. 13.5 gallons), for longer range between fill-ups.

The A3 stops much shorter than the CLA:

The A3 has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the CLA; 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 CLA don’t have a run-flat feature, either.

The A3 Premium Plus handles at .89 G’s, while the CLA 250 4MATIC pulls only .86 G’s of cornering force in a Motor Trend skidpad test.

The A3 is 7.7 inches shorter than the CLA, making the A3 easier to handle, maneuver and park in tight spaces.

The A3 has .9 inches more rear headroom and 1.3 inches more rear legroom than the CLA.

To make loading and unloading groceries and cargo easier, especially for short adults, the A3 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 CLA doesn’t offer a power trunk, so its trunk has to be closed manually.

The A3 has a 3461 lbs. towing capacity. The CLA has no towing capacity.

Heated windshield washer nozzles are standard on the A3 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. Heated windshield washer nozzles cost extra on the CLA.

Consumer Reports rated the A3’s headlight performance “Fair,” a higher rating than the CLA’s headlights, which were rated “Poor.”

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The A3 Prestige has standard headlight washers to keep headlight output high. The CLA doesn’t offer headlight washers.

To shield the driver and front passenger’s vision over a larger portion of the windshield, the A3 has standard extendable sun visors. The CLA doesn’t offer extendable visors.

Insurance will cost less for the A3 owner. The Complete Car Cost Guide estimates that insurance for the A3 will cost $2540 to $4465 less than the CLA over a five-year period.

Consumer Reports® recommends the Audi A3, based on reliability, safety and performance. The Mercedes CLA isn't recommended.

The Audi A3/S3/RS 3 outsold the Mercedes CLA by 39% during 2023.