Compare the Mini Cooper John Cooper Works GP - [2020] vs Rolls-Royce Ghost Black Badge 6.6 V12 Twin turbo - [2021]. 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 Mini Cooper John Cooper Works GP or the Rolls-Royce Ghost Black Badge 6.6 V12 Twin turbo. We'll leave it up to you to decide which is your favourite.