Having stayed at all, I would suggest Music, or Movies if you are renting a car. We stayed at Music last year, and the rooms were good. For design, I prefer Movies, because it was built after Music/Sports, and shows a few improvements on the design, esp. in the food area.
On the other hand, we stayed at POP a couple of years back, and didn't really like it. The buildings are 4 stories, which made the walkways more claustrophobic, and it didn't help that we were about as far from the main building as we could possibly be. Then there is the unfinished section across the water, looking creepy. Kindof killed the magic. We also noticed that to get to the food court, there was some sort of shop area that you had to pass through, and there was always some sort of candy at kids-eye-level. That would be a problem for us.
We liked Music so much, we booked one of the Family Suites for October.
Mick
