The V8 is sweet and rare, can't deny that. I won't pretend the 3.7 is superior, but I will say (1) it's a little more fuel efficient, (2) it'll be cheaper to maintain as these cars age, and (3) is still a pretty sweet engine. The VQ was an awarded engine and the 37HR is its final evolution, and there's some practical benefit to sharing the engine with other Infiniti (and Nissan) models. It's also lighter weight and likes to rev, which matches the overall nimble and sporty character of the car. It's a good match, so you can't go wrong if you get a clean car in a spec you like. I'll never say no to more power, and I wont pretend the 3.7 FX is a quick car by modern standards, but I can't say I really crave more power in it.