I'd have to say the WL has it all over the Poly. The self contained resort feel is primary. No need to drag out throught the heat to your separate building.
Location of the Poly isn't all that it's cracked up to be when the monorail isn't running properly (which was the case at our recent stay). The Poly was nice, yes but the WL is absolutely wonderful. The details are what make that resort so special and it beats the Poly hands down for restaurants.
I really enjoyed our stay at the WL.