I guess we have different tastes

All depends on what the OP thinks, but honestly they are both nice, just that the lines of the g35 coupe catches my eyes every time one of those drive passes me.
Are you looking to mod your next car? If yes, g35 coupe is definitely the winner especially when you can fit wheels with huge lips in the rear since they take much more aggressive offset wheels.
This is how a perfect G coupe looks like:

This flat colour is awesome on the g35 coupe, I don't like the "hellaflush" look with that much negative camber but still:
G37 coupe:
Nice front end when you're not planning to modify the front (not much options in terms of making the car stand out from the rest)
Too round and bulky every where else, it lost the the classic lines of the G35 coupe
G35 Coupe:
Nice front end when modified (the first generation g35 coupe front end is not as good looking, but the generation with the newer headlights and sport bumper is already sexy as hell)
Sexy side profile (as you can see above)
The rear is just awesome, plain awesome (stock is nice, modified is just mind blowing)