Performance, power and 0-100 km/h
2026 Audi RS3 Sportback has the quicker recorded 0-100 km/h time at 3.7 seconds, compared with 6.0 seconds for 2025 Mercedes-Benz C-Class C 300 4MATIC. 2026 Audi RS3 Sportback has the higher listed output at 407 hp; 2025 Mercedes-Benz C-Class C 300 4MATIC is rated at 258 hp, a difference of 149 hp. The torque figures follow 2026 Audi RS3 Sportback at 500 Nm and 2025 Mercedes-Benz C-Class C 300 4MATIC at 400 Nm. These figures describe straight-line potential only; they do not establish braking performance, ride quality, steering response or durability under repeated hard use.
Range, battery, charging and efficiency
2025 Mercedes-Benz C-Class C 300 4MATIC has the lower recorded consumption at 7.6 L/100km; 2026 Audi RS3 Sportback is listed at 9.1 L/100km. Test cycle, temperature, wheel size and charging conditions can materially affect these results, so only figures measured on the same basis should be treated as directly comparable.
Dimensions, cargo space and towing
2025 Mercedes-Benz C-Class C 300 4MATIC provides the larger quoted cargo volume: 455 litres versus 282 litres, a difference of 173 litres. 2025 Mercedes-Benz C-Class C 300 4MATIC is 370 mm longer overall. Exterior size is not a benefit by itself: a longer body may create useful room, but cargo shape, rear-seat space and ease of parking still require a physical inspection.
Price and overall assessment
2025 Mercedes-Benz C-Class C 300 4MATIC has the lower listed starting price at $45,400, compared with $65,500 for 2026 Audi RS3 Sportback. The measured categories split evenly, so the better choice depends on which attributes matter most. The assessment is based on the specifications shown here; it is not presented as a two-car road test.