Any monorail resort will do (Poly, GF, CR) and WL has pretty easy access to the monorail (short boat ride to monorail) so that works too. Poly would be my first choice, you can just walk from your room to the TTC and hop on the Epcot monorail, so that wins as the easiest, best choice (the other monorail resorts require a transfer at the TTC) If you don't want to go to the Poly, any other monorail resort would be next for easiest access to those two parks.