Western RPGs, hands down. JRPGS have never really felt compelling to me: The combat systems seem very simple, the stories linear, the characters one-dimensional, and I don't particularly like anime either.
But basically it boils down to this: I have no real choices, which I think is what RPGs are all about. I can't influence my character development, I can't influence the plot, it's just a linear route from A to B.
I'm sure there are exceptions to this, but I have played a few JRPGs which are generally considered top notch, such as Chrono Trigger and a few Final Fantasy's, and this is my all-round impression.
Hey, if you like JRPGS, knock yourself out, but when a game like Chrono Trigger, cited by many as THE BEST of its genre, merely gets a "Meh, it's alright." from me, it's pretty obvious that this is not my kind of game.