USRPGs focus more on Gameplay and Character custumization, while JRPG's tend to focus more on the story. Since I generally hate the Gameplay of USRPGs such as Morrowind, (Though I do enjoy Diablo II from Time to time) and I love Gameplay in JRPG's, (Especially Games Like WA4, FF XII, and Dark Cloud 2) its JRPG's all the way.

And yes, I say USRPGs simply to spite Grinenshire.