Compare the McLaren Speedtail 4.0 V8 Turbo Hybrid - [2018] vs Radical RXC 3.5 V6 Twin Turbo - [2014]. 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 McLaren Speedtail 4.0 V8 Turbo Hybrid or the Radical RXC 3.5 V6 Twin Turbo. We'll leave it up to you to decide which is your favourite.