Audi
A5
Owner report available
Mercedes-Benz
C-class
Owner report available
Audi A5 vs Mercedes-Benz C-class
The short answer
Based on available data, the Mercedes-Benz C-class comes out ahead of the Audi A5 on power. Check the specs table and owner sentiment below for the full comparison before deciding between the two. 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.
C-class
Overall
\nSentiment is mixed and highly dependent on generation, model year, and comparison context. For the W205 generation (approx. 2015-2021), feedback is generally positive, describing it as a comfortable, refined, and well-built daily driver that feels satisfyingly competent and smooth in normal conditions. It is frequently praised for offering a good value proposition in the luxury sedan segment.
Best version to buy
\nFor the W205 generation, the diesel models (e.g., 220d) are highlighted for their reliability and fuel economy, with the 2.1L diesel specifically noted for being "pretty much unkillable." The C300 with 4MATIC is also frequently recommended for its balance of power and all-weather capability. There is a strong recommendation to seek models equipped with conventional tires over run-flats for improved ride comfort.
Known issues
- \n**Declining interior build quality (W206 generation)**: Creaks, peeling plastics, and materials that do not age well compared to older Mercedes models or competitors.
The verdict
The Mercedes-Benz C-class is the better choice for most buyers.
It has more power on its best-equipped version than the Audi A5, based on the data above. If efficiency matters more to you than outright power, the Audi A5 is worth a closer look instead.
Explore further
Common problems by model year
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Frequently asked questions
Which is more reliable, the Audi A5 or the Mercedes-Benz C-class?
Owner reports show similar reliability sentiment for the Audi A5 and the Mercedes-Benz C-class. Check the known issues listed above for specific differences between the two.
Which is better for families, the Audi A5 or the Mercedes-Benz C-class?
Both seat a similar number of passengers based on our data. The Audi A5 is classed as a Liftback, the Mercedes-Benz C-class as a Station wagon, which affects cargo space and ride height for family use.
Which has better fuel economy, the Audi A5 or the Mercedes-Benz C-class?
The EPA rates the 2027 Audi A5 at 26 mpg combined and the 2027 Mercedes-Benz C-class at 27–29 mpg, depending on the version.
Which is cheaper to maintain, the Audi A5 or the Mercedes-Benz C-class?
Exact maintenance costs aren't in our data, but owner reports mention cost-related concerns more often for the Mercedes-Benz C-class than the Audi A5. See the known issues comparison above.