Compare the Audi A6 3.0T Competition - [2017] vs Maserati Quattroporte 2.0i V6 Biturbo Evoluzione - [1998]. 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 A6 3.0T Competition or the Maserati Quattroporte 2.0i V6 Biturbo Evoluzione. We'll leave it up to you to decide which is your favourite.