I have a friend with a Z32 TT and another with a VR-4. I've driven both, and I personally like the Nissan better. Mod for mod I think they're pretty much the same. Working on either one is a pain in the ass, and you can't nor will you make any serious power on stock twins.

They're both almost identical, power wise. They both have their ups and downs...

I'm a Rwd fan, so my pick would be the 300zx jmo.