Compare the Jaguar XJ R-S 6.0 V12 - [1989] vs Ford Thunderbird 428 Hard Top 5th Gen. - [1967]. 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 Jaguar XJ R-S 6.0 V12 or the Ford Thunderbird 428 Hard Top 5th Gen.. We'll leave it up to you to decide which is your favourite.