What is the difference between USO and USH? Other than Harry Potter at one (the kids and adults both dont have much interest in Harry Potter at all).
I've never been to USO so I'll let someone else compare, but USH is pretty small. We went to USH for two days last year and the only things we didn't manage were Mummy (my kids were too scared) and the Simpsons ride (I get sick on simulators and I recall that this one is worse than Star Tours). The backstage tour and Jurassic World are neat, but not worth the price of admission on their own. Harry Potter is the big draw and I thought that was worth it. If you aren't interested in Harry Potter then I would save my money and spend my time touring Hollywood and doing the Warner Bros tour. There is a TMZ tour that leaves from Hollywood and Highland that I thought was fun if you are into Bravo type shows - Vanderpump, etc.
ETA - Harry Potter is at both USO and USH. USO has two parks and two HP lands. There are more big thrill roller coasters at USO.