I'd hold all real comparisons until after you can drive both back-to-back. If I were to guess, I'd say the 370Z guys will probably be right in that the 370Z is more track focused.
I think these are 2 very different cars, although competing for the same buyers.
I will probably buy a camaro, but only cause I already own a great sports car and need a cool looking, fun to drive kid- toting 2nd vehicle. For that, the camaro is more appealing to me.