The Wilderness Lodge is tough to beat. Christmas and Wilderness Lodge just go hand in hand. Grand Floridian and AKL are also very nice. The Boardwalk would be amazing if the lobby was a bit bigger as their decorations are beautiful
We stayed at beach club one year at Christmas and loved it! The gingerbread carousel makes the lobby smell wonderful and it's so close to epcot and Hollywood studios. Haven't seen the boardwalk villas at Christmas time but I bet they are great too.