Compare the Citroen CX 25 GTi Turbo - [1984] vs Audi A1 A1 Sportback 35 TFSI S tronic S line - [2020]. 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 Citroen CX 25 GTi Turbo or the Audi A1 A1 Sportback 35 TFSI S tronic S line. We'll leave it up to you to decide which is your favourite.