For me it's YC and Poly.
YC - the smell when you walk in the lobby, the atmosphere is more relaxed than BC (there always seems to be a lot going on in that lobby), the views, the friendly staff, both restaurants are great, Stormalong Bay, walking to Epcot and the Boardwalk, the movies on the beach at night, Beaches & Creme
Poly - the smell when you walk into the lobby, the monorail, the theming, fireworks and hammocks on the beach, the restaurants, the views, there is one flower that is all over the resort that just smells heavenly, being taken to our room with our luggage on a golf cart while getting a tour of the resort