350 ragtop is ugly as hell with the roof up. It looks like the front end designers didn't meet with the rear end designers until 5 mins before the car was given the go-ahead.
370 ragtop is one of the best looking roadsters in the last 30 years.
350 interior is dull but plain, simple, classless.
370 interior looks like they just threw as much stuff in there as possible, and to hell with cohesive design.
350 coupe is a bit slab sided, but works well within the footprint.
370 coupe looked waaaaaay too fussy at first, but I think it was just ahead of it's time. I love it now, apart from the Nismo mk1 which looks like the basta...*snipped to prevent yet another huge anti mk1 argument*
All IMHO, YMMV, etc. All good solid cars, for me the 350Z HR is the pick of the bunch though.