Compare the Aston-Martin Valkyrie Spider 6.5 V12 - [2021] vs Porsche 9FF GT9 - [2008]. 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 Aston-Martin Valkyrie Spider 6.5 V12 or the Porsche 9FF GT9. We'll leave it up to you to decide which is your favourite.