I've stayed at both and my vote is for GF. Now the Poly is great, but there's just something about GF. Also that's where they hold the Wonderland Tea Party, Grand Adventures in Cooking, and the Pirate Cruise. There's also the Cinderella's Gala Feast. My kids (4, 5 and 7) loved the pools and the beach and we were the first stop going to the MK off the monorail. They're both great places for kids but everyone has their favorite and mine is GF.