Compare the BMW 3 Series M3 CS 3.0 Twin Turbo G80 - [2023] vs Mercedes GT AMG 63 S Turbo 4MATIC+ - [2018]. 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 3 Series M3 CS 3.0 Twin Turbo G80 or the Mercedes GT AMG 63 S Turbo 4MATIC+. We'll leave it up to you to decide which is your favourite.