Compare the Jeep Grand Cherokee 6.4 V8 SRT8 - [2012] vs Audi A3 S3 2.0 Turbo Sportback - [2016]. 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 Jeep Grand Cherokee 6.4 V8 SRT8 or the Audi A3 S3 2.0 Turbo Sportback. We'll leave it up to you to decide which is your favourite.