I haven't stayed at any of the presidential suites., But I'll throw in my 2 cents. If your party is planning to spend the bulk of their time at Epcot, then the resorts at the Boardwalk maybe the way to go. You can easily walk over. Lots of dining options at both Epcot and the Boardwalk area.
Personally I prefer AKL over WL, but that is me. Both WL and AKL were built by the same architect. WL has the boat that goes over to MK - which many folks mention. I think that AKL is a very special resort and feels secluded after a long day at the parks. I also love watching the animals plus the resort has beautiful, museum quality artwork located through-out. Dining options there are just as good, if not better than MK since you have Boma (which is buffet style), Sanaa, Jiko's (more expensive) and counter service Mara. at AKL you are getting 2 resorts; Jambo and Kidani and you can use the facilities at both. I do remember seeing someone post pictures of the AKL presidential suite and it was lovely. If I can find, I'll come back and post the link. If you think your party would like to "be on safari" for Christmas then go with AKL. If you think your party would prefer proximity to Epcot - then choose the Boardwalk. Each resort does decorate for Christmas, and WL will feel the most "Christmas" like since it is a mountain theme. Hope this helps you to make your choice. Happy planning!