Between a 350Z and a GT it's all down to the driver. Allow me to explain why.
I've always had a bit of a soft spot for the 350Z - good looks, decent performance, RWD - so before I bought the GT I did some digging. What I found was quite interesting, at least to me:
2003 350Z: 240/240 RWHP/RWTQ
2007 350Z: 260/225
2008 350Z: 280/220
2007 GT: 260/280
Then consider the mass:
04 350Z: 1450kg coupe, 1560kg vert
07 350Z: 1520kg coupe, 1620kg vert
07 GT: 1580kg coupe, 1680kg vert
Finally, toss in the gearing - which varies on the GT - and it's all one big mess. Depending on the model year of both vehicles, it's basically a coin toss. Ergo, it's down to the driver. Case in point; the 350Z that beat the 04 Cobra - or when I took a boosted 350Z. Sometimes you just stumble upon a worse driver than yourself.
(99-01 Cobras I don't really care much for compared to the 03-04 Terminators. The former are rated at 320/317, whereas the latter are at 390/390 (by many accounts underrated, as they usually did a corrected 410 on the crank). A stock Termi with a decent driver will pull low to mid 12's in the quarter. Add some very basic bolt-ons and they're at >500RWHP. But I'm digressing.)
Yet again, congrats on the car, Niko! Grey > Pseudo Scooby blue any day.