Pick the GF - here is why.....
1) with a 1 and 5 year old - you are not walking to the TTC - unless you are carrying them - even with strollers it is a hike.
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I have to disagree with this. If you have a stroller(s), it's perfectly doable. We stayed at the Poly and walked to the TTC every time we went to Epcot, no problem at all, probably only about 7-8 minutes tops I'd say. I would think the 5 y.o. could walk that if need be, if you don't have a stroller, I'm not sure how you'd feel about carrying the 1 y.o.
I've never stayed at the GF, but I can tell you our kids (almost 3 and almost 5 at our trip time) LOVED the Poly. Great pool, if it's warm enough, your 5 year old would likely love the slide. Great CS at Captain Cook's, too.
Haven't been at Xmas time either, so I can't comment on that.