Compare the BMW 2 Series M240i xDrive Cabrio 3.0 Turbo F23 - [2021] vs Audi A4 S4 TDI 3.0 V6 - [2019]. Find out which car is the fastest, most powerful, lightest or has the biggest engine in our top trumps style comparison page. Find out which car has the highest top speed or is the fastest accelerating, is it the BMW 2 Series M240i xDrive Cabrio 3.0 Turbo F23 or the Audi A4 S4 TDI 3.0 V6. We'll leave it up to you to decide which is your favourite.