I have been to Pop twice. Once as a solo traveler, and once as part of a ladies trip (had my own room). I initially selected Pop since it did not share busses. I also figured that the theming of the All stars would have more appeal to kids. I was happy with that choice hotel. Both times I had a room by the bowling pin pool. I really enjoyed that location.
I have not stayed at any of the All Stars, but will be staying at Music in August when I travel with my nephew. If your budget allows, it may be nice to have a suite at Music, even if it is only the 2 of you. I have a suite reserved even though it is just the 2 of us since I need a fridge for my nephews needs and I love to have a coffee pot. The suite will give us a bit of privacy as well.