Compare the BMW 5 Series M550d xDrive F10 - [2013] vs Renault Megane RS 1.8 Turbo 280 - [2017]. 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 BMW 5 Series M550d xDrive F10 or the Renault Megane RS 1.8 Turbo 280. We'll leave it up to you to decide which is your favourite.