Compare the Jensen Interceptor 4.0 12v Cabriolet - [1949] vs Mercedes 300 S Roadster - [1951]. 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 Jensen Interceptor 4.0 12v Cabriolet or the Mercedes 300 S Roadster. We'll leave it up to you to decide which is your favourite.