Compare the Lamborghini Aventador LP 780-4 Ultimae Roadster 6.5 V12 - [2021] vs BMW X6 M Competition 4.4 V8 Turbo F85 - [2019]. 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 BMW X6 M Competition 4.4 V8 Turbo F85. We'll leave it up to you to decide which is your favourite.