Compare the Audi A3 S3 2.0TFSI Quattro - [2007] vs Seat Leon ST Cupra 265 DSG - [2015]. 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 Audi A3 S3 2.0TFSI Quattro or the Seat Leon ST Cupra 265 DSG. We'll leave it up to you to decide which is your favourite.