Since I'm a Boardwalk DVC owner, I'll say it's Boardwalk. However, since you have very young children, you might want to consider the Villas at Wilderness Lodge (VWL). They are just across the lake from MK which is where I suspect you'll be spending most of your time at. Having a full kitchen is so wonderful, as well as having your own personal washer and dryer. You also can't beat the whirlpool tub in the master bedroom for a relaxing massage from a day in the parks. We usually send a grocery list for breakfast and other food items to WeGoShop, and have them do the shopping, and then deliver everything to us. Remember though, the closer it gets to Christmas, especially Thanksging till, rooms at DVC's become almost non existant to get. Members have a 11 month window to book first in, and a lot of them have already done this for the upcoming holidays. You may want to try and rent points from a DVC member and see if they can get you in at this point. Also be awear that the holiday season at Disney is one of the busiest, and most crowded times of the year. Wall to wall people!
I hope ya'll have a great time, just as we did last year!