Audi
A5
Mercedes-Benz
CLA
Audi A5 vs Mercedes-Benz CLA: 2025 Comparison
The short answer
The Audi A5 offers fuel economy, while the Mercedes-Benz CLA excels at power instead. Choose the Audi A5 if you prioritize fuel economy in daily driving, or the Mercedes-Benz CLA if power matters more for your needs. Both are covered by real owner reports on CarWizz.
Specs side by side
What owners say
A5
Overall
Sentiment is sharply divided by generation. For the B9/B9.5 generation (approximately 2017-2024 models), feedback is overwhelmingly positive. Owners praise these models for being "rock solid," offering a superb driving experience ("drives like it's on rails"), excellent build quality with no squeaks even at high mileage, and strong reliability with proper maintenance.
Best version to buy
For the B9/B9.5 generation, the A5 Sportback is the most recommended body style for its blend of coupe-like aesthetics and hatchback practicality. The S-Line trim is strongly advised for its superior interior and sportier suspension.
Known issues
- ⚠**B9/B9.5 Generation (2017-2024):** * High maintenance and repair costs out of warranty. Frequency: very frequent. * Known issues with the 2.0T engine (e.g., water pump failure). Frequency: recurrent.
- ⚠**B10 Generation (2025+):** * Severe software and electronic glitches (drive assist failures, phantom alerts, SOS connectivity loss, infotainment crashes). Frequency: very frequent. * Unreliable mobile app and digital key functionality.
CLA
Overall
Sentiment is sharply divided and heavily dependent on model year, powertrain, and owner expectations. For the first-generation (approx. 2014-2019) CLA, sentiment is predominantly negative, characterized by widespread criticism of its stiff ride quality, perceived cheap interior materials, front-wheel-drive-based platform, and recurring mechanical and electrical issues, particularly with aging examples. It is frequently described as an overpriced "entry model" that prioritizes the Mercedes-Benz badge over traditional brand virtues like driving dynamics and luxury.
Best version to buy
Insufficient owner data available to declare a consensus "best" version. Positive mentions are split: the CLA 250 4MATIC is noted for good all-weather capability and value as an introduction to the brand.
Known issues
- ⚠**First Generation (2014-2019) Specific:** * **Transmission problems (DCT/7G-DCT)**: Grinding noise on light acceleration from stop, whining in second gear, erratic RPM behavior, sluggish/unreliable starting. Frequency: very frequent.
- ⚠**Second Generation (2020+) & Cross-Generation:** * **Serious engine failures in 2021+ models**: Complete engine replacements required under warranty for CLA 35 AMG and other Mercedes models, with concerns about issues arising just after w…
The verdict
The Audi A5 is the better choice for most buyers.
It has better fuel economy on its best-equipped version than the Mercedes-Benz CLA, based on the data above. If power matters more to you than running costs, the Mercedes-Benz CLA is worth a closer look instead.
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Frequently asked questions
Which is more reliable, the Audi A5 or the Mercedes-Benz CLA?
Owner reports show similar reliability sentiment for the Audi A5 and the Mercedes-Benz CLA. Check the known issues listed above for specific differences between the two.
Which is better for families, the Audi A5 or the Mercedes-Benz CLA?
Data on family-specific factors like cargo space is limited for one or both models, but based on available reports, both are positioned as practical daily drivers. Check the specs table above for seating and body type.
Which has better fuel economy, the Audi A5 or the Mercedes-Benz CLA?
The Audi A5 is more fuel-efficient on paper: 2.2-7.4 L/100km combined versus 8.8-9.2 L/100km for the Mercedes-Benz CLA, based on the best-equipped catalogued version of each.
Which is cheaper to maintain, the Audi A5 or the Mercedes-Benz CLA?
Exact maintenance costs aren't in our data, but reliability signals above are the closest proxy: fewer reported issues generally means lower repair costs over time.