I really wouldn't. On the shortlist before the 645 were various Skylines as I've never owned one, but I only looked at the GTSTs as the GTR held no appeal for me as a driver. Same reason I bought the 911 over the GT-R. I've no doubt the R33 GTR is a quicker car than a GTST, and it's probably a better car in every measurable way, it's just not the one I'd want to own.
The majority may want the GTR, and that's fine. I just don't want to be like all the others; I've always said I'd rather go slower and have more fun.