Compare the Lamborghini Countach LP5000S QV - [1985] vs Mercedes SL Class 63 AMG Performance Package - [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 Lamborghini Countach LP5000S QV or the Mercedes SL Class 63 AMG Performance Package. We'll leave it up to you to decide which is your favourite.