We've stayed at Movies, Music, and Pop. Of course, Pop is newer. Pop has their own buses. Pop has a few more things to offer like the lake, the walkway, and do they have surrey bikes now??? Pop appears to have so much more thought put into it. I would never stay at Music over Pop. But, Movies for us was hard to beat. We liked the food court at Movies sooo much better, because of the selection. This sounds silly, but we thought it was easier to get to the buses at Movies than we did at Pop. I can't remember why, it just seemed more congested at Pop, and not because it was busier. And although Pop has plenty of Disney icons, it still can't beat Movies. The Toy Story and Dalmatian area are just awesome.
I think they looked at all of the complaints from the All Stars and "fixed" them in Pop. Tyler did a good job telling the differences in his thread about Pop. I think that he just did such a good job on Pop that I felt like I knew that resort better.