Compare the Bentley Continental GTZ Zagato 6.0 W12 2d - [2008] vs Porsche 911 Turbo 996 - [2000]. 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 Continental GTZ Zagato 6.0 W12 2d or the Porsche 911 Turbo 996. We'll leave it up to you to decide which is your favourite.