I have also stayed in all the values more than once.
Music is my favorite because it is quieter and has more of an adult crowd as it seems to be the favorite for budget honeymooners. At first the theming didn't grab me, but once I slowed down and really looked it at, I think I like it best of all the values. For instance the New Orleans rose garden and wrought iron bench in the jazz section, the horse corral with real saddles in the country, etc.
Movies has the most colorful, charming theming, but it is so hard to get a room there as it is very popular.
Sports IMHO has the best bus schedule/service; while I certainly would stay there again, I'm just not a huge sports fan. ("Real" sports fan--I like the resort.)
Pop has the best food court with more offerings, including the grilled flatbreads. It also has an indoor lounge and an outdoor lounge. I've probably had the best front desk service (of the values) at that resort. What keeps Pop from being my favorite is just the size and hence, number of people. it seems the food court was constant, loud mayhem--not matter what time of day or night, and there was always something of a line at the bus stops (from the resort or from the parks back.)
I don't think you can go wrong with any of them; and I will happily continue to visit!