How about 2 out of 3?
We stayed at GF in 1999 and at Poly in 2000.
We are going back to GF in July of this year.
What we liked about the Grand Floridian:
The elegance of the resort, our beautiful room in Boca Chica, the HUGE swimming pool, walking around the resort at dusk taking in all the sites, sitting on the beach watching the EWP, renting water mice and driving around 7 Seas Lagoon, watching the castle change colors, eating at 1900 Park Fare, having great sandwiches at Grand Floridian Cafe, being a quick monorail stop to MK.
What we liked about the Poly:
The relaxing atmosphere, the nightly torch lighting ceremony, the smell of the resort (very tropical), sitting on the hammocks, eating at Kona Cafe and Ohana's, hearing the drums from the luau, seeing the luau, the CM's are extremely nice, everyone is your "cousin" going around saying "ALOHA" several hundred times per day, the pool, refillable mugs, great coffee, feeling like you are in paradise.