Compare the Alfa-Romeo Stelvio 2.0 Turbo 16v Q4 - [2016] vs BMW X5 4.8i V8 - [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 Alfa-Romeo Stelvio 2.0 Turbo 16v Q4 or the BMW X5 4.8i V8. We'll leave it up to you to decide which is your favourite.