Just like several other posters on this thread, I am looking at both of these cars for my next vehicle purchase. What a tough choice! The main differentiators / pros and cons for me are: GenCoupe has back seat, better LSD, probably cheaper to insure (any input on this?), no oil overheating issues, probably easier to negotiate price at dealership
BUT has HUGE transmission problems that still don't have an official fix, will definitely have/want to mod it way more that the Z to feel happy with it (right off the bat will have to buy coilovers, wheels, tranny bushings and quick-shifter and possibly swap the engine/tranny mounts) that will make the dealer give me a hard time if I ever need work done under warranty. Lastly... sorry but it is a Hyundai... there is no other car made by this company that I would've ever though about buying and unfortunately the first thought that comes to most people mind when they hear this brand is "cheap"
Now for the 370Z: True sportscar, proven long-time reliability (i plan on keeping whichever car I buy next for a long time - so please chime in if I'm wrong) and plenty of time to work out all the little details since Nissan has extensive experience building sportscars and the fact that this model is based on the 350z. Complete set of features of what I want in a car on the base model + sport package save some minor things easily done aftermarket. And now for the cons: NO BACK SEAT! This could be a deal breaker and the biggest compromise for me... oil temp issue and cheap LSD, lower residual value than the GenCoupe?? (Not sure about that).
Honorable mention: if I can hold off on the purchase for a while, the
Toyota/Subaru/scion FT86 would be another option, but a lot is still uncertain about it so we'll see...
One thing is for sure, after writing this post the 370z seems like to better option of the two IMHO. By the way, Im looking at getting either a 2011 3.8 R-Spec (or maybe Track?) or a 2010 Base+SportPkg 370z but If I could afford it, without a doubt the car I would get is a Black 10' NISMO 370z