Compare the Mercedes SL Class 65 AMG V12 Black Series R230 - [2008] vs Porsche 911 GT3 PDK 992 - [2021]. 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 Mercedes SL Class 65 AMG V12 Black Series R230 or the Porsche 911 GT3 PDK 992. We'll leave it up to you to decide which is your favourite.