I've only been to the Beach Club, but if I had to pick one I would pick Yacht Club because of the full balconies, Stormalong Bay and the closeness to Epcot, which is my favorite park.
If I wanted to be close to MK, I would pick the Poly, because we visited it and liked the tropical feel of it.
However, if we go next Christmas, DS wants to go to AKL to see the animals when he wakes up in the morning.