I've driven all 3.Owned a S/C Z and a Supra and my best mate had an Evo 7 for 3 years.
Evo is a money pit. If you get an AYC fault prepare to dig deep to fix it
The Z is my favourite car ever, If I had the chance to get my old one back to the spec it was before I stripped it for parts I'd take it back over any other car I've owned since.
The Supra is a brilliant car. I'm actually enjoying buying parts for it as they are so cheap compared to Z/GTR prices
The Z & the Supra are very similar to drive IMO. You really need to try them all first though. Personally I wouldn't bother with the Evo, its unreliable, expensive to maintain & its ugly as hell.