Compare the Renault Megane RenaultSport 2.0T 265 Cup - [2012] vs Porsche Cayenne GTS 4.8 V8 - [2012]. 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 Renault Megane RenaultSport 2.0T 265 Cup or the Porsche Cayenne GTS 4.8 V8. We'll leave it up to you to decide which is your favourite.