All the parks are pretty festive, but none are "over the top". We were just there, and I'd say Epcot, MK and HS are all pretty close together, with AK being the "least"...but that's not meant to be a negative, it's decorated too.
Don't forget about Disney Springs. The Christmas Tree trail is pretty cool, and the Christmas store is always awesome.
Epcot has more Christmas related activities, Magic Kingdom looks beautiful right now, but I was in love with Hollywood Studios' decorations. They did a great job this year.
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