Compare the Audi Q7 4.2 V8 - [2005] vs Alfa-Romeo Brera 3.2 V6 Qtronic - [2006]. 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 Audi Q7 4.2 V8 or the Alfa-Romeo Brera 3.2 V6 Qtronic. We'll leave it up to you to decide which is your favourite.