Compare the McLaren 625C 3.8 V8 Twin Turbo - [2014] vs Audi R8 6.0 Quattro V12 TDI - [2009]. 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 McLaren 625C 3.8 V8 Twin Turbo or the Audi R8 6.0 Quattro V12 TDI. We'll leave it up to you to decide which is your favourite.