Hmmm...I have read that the linens (bedding/towels) aren't as nice at values, no towels at the pool, more spread out (vs WL), can only take buses, heard AoA's TS area gets really busy, might see larger tour groups that tend to 'take over' pools/other areas at the resort (tend to stick to other values/mods though).
It really depends on what you want. I love WL, because it is very relaxing, and is a break from all of the 'in your face' craziness in the parks. I feel that AoA is just a continuation of that craziness, and no real break from the 'fun.' That being said, this is probably the last time the kids would want to go to AoA, as they might age out of it over time. They would love it.
I am someone who prefers deluxe stays, BUT we have 2 days I haven't booked in December prior to a 5 night BLT stay (my personal fave resort, WL second). We ARE considering AoA, simply because our kids are at great ages for them (3 and 7). I will most likely end up at WL or BC, but AoA is on my short list. However, my inlaws will be with us for our BLT stay, no way would I have suggested AoA for them. If grandma/grandpa are coming, then we go for relaxing over kid crazy. ESPECIALLY if they are paying ; )
Let me really throw you a curve ball...have you looked into renting points and staying at a DVC resort? Having separate bedrooms + a common area, with kitchen/dining/washing machines/etc. is really wonderful and a 2br runs about the same price as 2 deluxe rooms. If you go that route, I would recommend Kidani or BLT to give you a third full bathroom.