XJ220 was really cool to me, mostly due to its great soundtrack
by Martin Iveson (aka Nuke/Anarchy aka Atjazz), featuring many sweet groovy tunes.
Lotus 2 title/menu dancey tune, was also cool though, and a real classic now.
Both games were quite equivalent on the gfx side, with good car and scenery sprites, and great tracks and hazards graphic engines.
But on the gameplay side, Lotus 2 was much more playable, fun and smooth than XJ220.
So, Lotus 2
is the winner for me.
(and looking back on both these 90's UK sports cars, both still look cool irl