Compare the Vauxhall-Opel Vectra 3.2 V6 GSi - [2002] vs Audi A5 Sportback 3.0 TDI - [2011]. 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 Vauxhall-Opel Vectra 3.2 V6 GSi or the Audi A5 Sportback 3.0 TDI. We'll leave it up to you to decide which is your favourite.