I love the GF. I have stayed Poly LVconcierge, and was underimpressed.
The GF is charming and the CMs are friendly. The pools at the GF are nicer and larger than the Poly pools. Gasparilla's (fast food place) is much nicer than the one at the Poly. The game room at the Poly had broken, old & dirty games. The one at GF is nicer. The game room & pools are important to them. My kids prefer the GF over the Poly any day. (5, 9, and 15)
I have stayed at almost all the deluxes and the Poly just didn't do anything for us. (just my opinion, I know some just love the place) We love Hawaii and that whole atmosphere, but the CMs at the Poly were less then friendly and the pool is small and very crowded. The decor just doesn't do anything for me, either. The GF is just gorgeously decorated for Christmas, too. I am so excited to be returning soon!
We leave for our trip in 2 weeks. I made some adjustments to the tail end of our trip today, and my husband gave me the choice of adding 4 poly concierge days or 2 GF days and I chose 2 GF.

He was happy with my decision as he doesn't like the Poly too much, either, but he was looking at the bottom line $$$$....
Happy planning! Too many choices.....
Lives4Disney