They're all MR (Mid engine Rwd) except from KITT which is FR (Front engine Rwd).
Both MR2 and Esprit are both light weight and very 80's sharp angle style model which is good to create with less vertices and more details.
F40 is the successor of the 288GTO, so it is very similar in performance because of the power/weight ratio. But F40 is an such an icon...
Testarossa is a great looking 80's GT so it would be a ZR1 competitor.
Kitt is a great car for stunts, it is natural acrobatic car. Good for use with power bug for simulate its SPM mode.
That is my opinion, but mainly they are all cars that I could create with joy.
PS: other car that I forgot to include in this poll, a car to make pair with Porsche March Indy, the successful Marlboro McLaren Honda MP4/4. Sorry to all that already voted... I'd to reset votes.