We went over thanksgiving last year with my 18 month old daughter. She enjoyed the splash pad and there was ample room for her to explore. My only complaint would be getting on the monorail with a stroller was a pain having to wait for the few elevators in the GF lobby.
if you were planning more resort time, I would probably pick an Epcot resort. There are more things to do in that area and you can walk to Epcot and DHS, so I feel you have more freedom. However, if hopping isn’t available when you go, then an Epcot resort may not be that attractive. The pool at the Boardwalk is smaller than BC/YC, but easier to keep an eye on your kids.
For what it is worth, I own DVC at GFV and BWV and prefer BWV even with a toddler.