Compare the Alfa-Romeo 8C Competitzione Spider - [2008] vs BMW 3 Series M3 3.0 Bi Turbo G80 - [2020]. 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 Alfa-Romeo 8C Competitzione Spider or the BMW 3 Series M3 3.0 Bi Turbo G80. We'll leave it up to you to decide which is your favourite.