I know Pop seems to get a lot of love, but we actually much prefer the All Stars! We've stayed Pop, Movies, and Sports. And my sons are actually at Music with a band trip as we speak!
Seems that a lot of the negative posts about the All Stars have to do with them sharing buses and Pop being dedicated. Well, in actuality they only share buses at "off" times. You won't get that at park open and close--they'll have their own buses. On the other hand Pop has a TON more rooms than any of the single All Stars and all those people are lined up for that same set of Pop buses. Looking at the lines at the parks, the Pop line is always huge!
We found the Pop food court to be chaotic, loud, busy all the time. The All Stars less so.
If you have a preferred room at Pop, it's not bad. But if you have a standard room, some of those can be a long way from the bus stop or food court. All Star resorts are just smaller in general.
Rooms are basically the same at any of them.