...and the UPH DOES include admission to DisneyQuest.
Just be aware that the UPH tends to be one of the more expensive ticket media. When comparing with Hopper passes, you really need to make liberal use of the "Plus" parks (BB, TL, Pleasure Island) in order to justify the additional cost. If you don't intend on visiting these parks, you may be better off with a Hopper pass for the 4 main theme parks and single-day passes to DisneyQuest.
Also, note that the UPH must be purchased for the entire duration of your stay. You will typically be allowed to drop off the day that you arrive and/or the day that you leave, but you must pay for every day in between whether you intend on visiting the parks those days or not.
Finally, the UPH admission priviledges end with your vacation. Days on hopper passes never expire, meaning that if your plans change you can always keep the paper ticket and take advantage of those unused days on another trip. With the UPH, you still pay for admission even if you don't set foot in the parks on a given day during your stay.