I've stayed at LM AoA and ASMu.
For another value trip I'd pick ASMu (or any AllStar) over AoA.
It was nice but but I prefer the size, feel, and ease of Music over Animation.
Plus I'm not a huge icon fan. Ursula creeped me out.
If the pool is important I know that the main pool at AoA has gotten great reviews so that might be a consideration if your kids are pool snobs and wouldn't be happy with a basic pool.
I did not think the walk was huge from LM to bus/food, but I know that has been a huge factor to many, so an AllStar might be the better option.
I was also happy with the AllStar menu, though AoA has a different selection and is preferred by some.
Music and AoA LM rooms are pretty much the same size and configurations so I don't think the rooms make any difference.
For me it was all about the actual resort and the fact that ASMu is cheaper. I would choose the less expensive and do the extras in the parks and dinning.