Compare the Mercedes SLR Class McLaren Roadster - [2009] vs Porsche 911 Ruf CTR Yellow Bird - [1987]. 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 Mercedes SLR Class McLaren Roadster or the Porsche 911 Ruf CTR Yellow Bird. We'll leave it up to you to decide which is your favourite.