I have had both G35 & G37S. I like the sound of the G35 more than the G37, but I like the body style of the G37 more than the G35. I believe '06 - '07 G35 had the best looking front bumper out of the G35 years.
The Z will have a little more hp & wider wheels (Nismo vs. IPL). The Z is a little bit more of a sports car. I always thought that the Z was for people in late teens or early twenties & the G was more for older/serious people. Now I see that the Z is more sportier & more of a mid life crisis toy.
You can get all the amenities in either car. It comes down to if you want a firm ride, or if you want a firmer ride (almost harsh).
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