I agree with Magic Kingdom. Depending when you are going, I would also suggest going to a Christmas party. I am in my early 60's & nothing says Disney at Christmas to me like the Christmas parade. Early in the month, you can only see it at the party.
The Candlelight Processional is great. But personally, we have little interest in the story tellers. So for us, Epcot would come after MK. For resorts, we like the Epcot resorts. BC has a gingerbread carousel, YC has a huge miniature winter village/ train scene & BWI has a gingerbread merry go round & miniatures too. We like the other decorations of those resorts too. Many people prefer Wilderness Lodge's decorations. But we aren't fans of the nature type decor there.