Compare the Koenigsegg Regera 5.0 V8 Turbo - [2015] vs Bugatti Veyron 16.4 Grand Sport Vitesse - [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 Koenigsegg Regera 5.0 V8 Turbo or the Bugatti Veyron 16.4 Grand Sport Vitesse. We'll leave it up to you to decide which is your favourite.