I see you’re already doing a split stay at CBR, otherwise I would’ve recommended a split between these two...
We stayed at both during Christmas week. Checked out of AKL on Christmas Eve and into Poly.
AKL has my heart. In addition to being an amazing getaway resort year around, at Christmas, the resort is enchanting. From the massive tree/garlands to the BGM, the resort is top-notch. The week(s) preceding Christmas, there are carolers in the lobby every other night, as they alternate between Jambo and Kidani. On the alternative nights, meet and greets take place. We were able to see Minnie dressed up in her holiday outfit. The bus service is also great, zero issues at all.
Poly obviously has the MK views, location, and monorail, but I’m not a fan of the lobby or it’s traffic, especially during the holidays. The decor is beautiful, but, imo, nowhere equivalentent to AKL. We also do not spend as much time in the lobby like we do at AKL because of room proximity and crowds, so I don’t know what they offer as far as Christmas entertainment. I know you would get to hear my HI family’s beloved Pidgin 12 days of Christmas on loop, which is entertainment in itself

. Seriously, we do love the Poly, but for Christmas, we mostly moved there due to the monorail/location to MK on Christmas Eve/Day. Otherwise, we would’ve just stayed at AKL.
HTH