Compare the Koenigsegg Agera RS 5.1 V8 Twin Turbo - [2015] vs Bugatti Chiron 8.0 W16 Quad Turbo - [2016]. 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 Agera RS 5.1 V8 Twin Turbo or the Bugatti Chiron 8.0 W16 Quad Turbo. We'll leave it up to you to decide which is your favourite.