Compare the Lamborghini Aventador LP 780-4 Ultimae Roadster 6.5 V12 - [2021] vs Mercedes SL Class 73 AMG V12 R129 - [1999]. 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 Aventador LP 780-4 Ultimae Roadster 6.5 V12 or the Mercedes SL Class 73 AMG V12 R129. We'll leave it up to you to decide which is your favourite.