Last Fall we did a split stay at Pop / All Star Movies. Both rooms were very similar. The way the resorts operated was very similar. Bus service was about the same. Here's the difference. May be important to OP, maybe not.
Food Court. ASMovies definitely lacking compared to Pop. ASMovies had no espresso coffee - a big No-No for me. Food choices were so-so. Pop had espresso coffee, and lots of enticing food choices.
Gift Shop. ASMovies' gift shop was tiny and lacked a lot of merchandise. Pop gift shop was pretty big and comprehensive. One jacket I saw at Pop, I decided to get later after I checked out. Couldn't find it anywhere in the parks or DTD in the right size. Made a trip back to Pop and there it was, waiting for me. Awesome!
Other. Pop is a short walk across the bridge from AoA. If you stay at Pop, you can change up your meals by crossing the bridge and eating at AoA food court. AoA food selections are unlike those anywhere else.
DD would like Little Mermaid section, but... No Discounts. Far Away from main building.
Conclusion. IMO, POP is the choice for you. Your DD will love Pop, and she'll also love walking around AoA, since it's right there. Also, POP/AoA are on a nice-sized lake. No lakes at All Stars. Pop is less per night than AoA. Case closed.