Personal preference. They all have the same rack rates, so they are probably pretty equal with teen groups. Athletes gravitate towards Sports, but there are dance competitions and high school band/chorus groups that prefer Music or Movies.
Movies gets love because renovations are complete and the theming is so “Disney.” Lots of great photo ops outside and guaranteed new decor inside. When buses combine, this is the last stop, so getting a seat (or on the bus) might be less likely, but is not a common problem.
Music might have slightly more families and fewer teen groups because of the family suites. Renovations are underway so depending on your dates you may have a better or worse chance of a refurbished room. Pool hopping is allowed between the thee All Stars, and being in the center makes it easier to visit the other resorts (or walk back if a Sports or Movies bus comes first at your park).
Sports has not started the renovations yet, but it actually has slightly higher guest ratings than the other two. When buses combine, it’s the first stop, so you know you’ll get on.