Compare the Buick Riviera 7.5 V8 - [1971] vs Mini Cooper John Cooper Works Clubman - [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 Buick Riviera 7.5 V8 or the Mini Cooper John Cooper Works Clubman. We'll leave it up to you to decide which is your favourite.