Compare the Bentley Arnage R 6.8 V8 Turbo - [2002] vs Audi A8 3.0 TFSI Quattro - [2010]. 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 Bentley Arnage R 6.8 V8 Turbo or the Audi A8 3.0 TFSI Quattro. We'll leave it up to you to decide which is your favourite.