We just got back from OKW, stayed in a 1 Bedroom and the bed was very comfortable. I cannot speak to what is better if you are in a wheelchair, but I do know a number of buildings are designated as Handicap accessible (building 13 is right across from the Hospitality House), and the map has been posted here.
We have not stayed at AKV. The one thing that might make it a bit more Handicap friendly is that it is more of a contained resort. The Main Building where you stay has everything right there (restaurants, shops, lobby etc), where at OKW it is much more spread out. Some buildings are pretty far from the main area.