I have never stayed at the Poly but I stayed at the GF for my Disney Wedding and honeymoon last December and absolutley loved it. It was so romantic and relaxing. We were there 2 weeks and I refused to go to the check out counter with my husband because I did not want to leave. We both love the Victorian style and in December it was just stunning. We came back many nights to the lobby via monorail and got to walk by this enormous tree, the gingerbread house, all the wreaths and garland...it was just incredible. Plus, the turn down service and lagoon view (if you book a lagoon view)...HEAVEN!! Not sure if we can afford it this year but we don't want to stay anywhere else, it was just that good.
However, alot of people love the Poly. It does seem very relaxing also and laying on the beach in a hammock drinking out of a coconut does look nice also. Good luck with your choice.
Have A Magical Day!