Compare the Mercedes 600 SEL V140 - [1991] vs Seat Ibiza 1.8 Cupra R 20vt - [2001]. 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 Mercedes 600 SEL V140 or the Seat Ibiza 1.8 Cupra R 20vt. We'll leave it up to you to decide which is your favourite.