Again Kona, it’s a highly personal choice. None of us could ever, in good conscience, suggest the “best” controller for someone else (it’s hard enough picking the best one for yourself at times, LOL).
If he has been talking about the SX2 (great controller btw), I’d get him that one. While the NV is a nice controller too, it’s different and he might not be too charmed by the screens (I, for example, would not want them). And/or he might have a strong desire towards Pioneer as brand. All in all, they are both good controllers, but if I am to give any advice at all, go for the SX2 (might want to look out for one of the “collectors” editions in white, gold or something, if he is into that sort of thing).