We enjoyed our stay at the Poly, but the lobby was bustling and the pool was crowded (more crowded than any other resort pool we've used at the same time of year). It's a nice resort but not worth the price premium over most of the other deluxe resorts imo. If I wanted an expensive monorail resort for a special occasion, I'd choose the Grand Floridian.
I've never stayed at SSR. Animal Kingdom Lodge is one of the most affordable deluxes if you get a standard room (some of these, on the Kudu trail, even have animal views). It's relaxing & beautiful & wins over the overpriced Poly in a heartbeat imo.