At All-Star Music, you have a full kitchenette area with shelves and cabinets
Two regular closet areas next to the sinks
Large living room
One double pull-out sofa, one chair bed and one ottoman bed
TVs in living room and bedroom
Regular pool and kiddie pool plus quiet pool
Access to Sports and Music pools and food courts
whereas AofA has a little kitchen area in the living room.
A locker with hanging rod in the living room
Living room and dining room
One double pull-out sofa, one double murphy bed dining table
TVs in living room and bedroom, whoever sleeps in dining room has no TV
Big Blue Pool with zero entry, splash area and quiet pool
One food court
Both resorts have the same number of rooms and one bus.
All-Stars share buses in the middle of the day when it's not busy
My opinion is I'd rather choose the smaller resort but I don't have small kids. We also like the big living room and we use the kitchenette area. The theming is calmer in the room for sure, based on what I've seen of AofA, and the outdoor atmosphere is boring vs. the AofA areas.
Art of Animation definitely looks much more fun and over the top.