Round the track and 0-62mph it will have to be Skyline R-34 GT-R. Not top speed.
Both come out or came out of the factory at a price of nearly $90000 so we may say that they both employ the same level of technology and equippement. Not quite:
-NSX has nearly 200 kilos less weight and is built with a lower draf coeff. The NSX has it in top speed as the GT-R is limited at 155mph. By now, these are the only advantages of the NSX.
-the Skyline comes with nearly 50 hp more(proved on the dyno, as a production car). It has an inline6(more balanced than a V6) TT engine that comes also with turbo lag, but also with more torque once it gets on its optimum revs. It has AWD, so better grip, also all wheel steering, a better traction control and better stability control systems.
So, I go with the Skyline 100%.
Not sure?!... check this out:
http://www.supercars.net/cars/1999@$Nissan@$Skyline%20R34%20GT-Rg.html
http://www.supercars.net/cars/2002@$Acura@$NSXg.html
and
here u can find a video for 0-62mph NSX vs. R34 GT-R and more, if they are still available:
http://www.gtrcentral.com/