We were at WDW for Christmas last year. We visited a few resorts, and my favorite was GF. Then probably AK.
The decorations at GF was grand and beautiful. My least favorite was poly, and that's where we were staying at..
We haven't seen GF at Christmas time, but the WL would be hard to beat. The theme of the resort, before the decorations, alone give it a leg up on the competition. Add to that the massive themed tree, the garland that's ALL over the log railings, the evergreen wreaths, and you've got the perfect "backwoods" Christmas... without the snow.