GF, because it's tops. We stayed at WL, AKL and GF on our wedding/honeymoon trip and anything less than the Grand was a step down. It's all relative of course, so YMMV.
If I could pick any DELUXE resort to stay at, I'd pick Poly, to me it seems like the most romantic of the deluxe resorts. It's got a beautiful beach on the lagoon, tiki torches and hammocks, a view of the castle, and the monorail stop-who needs more?! My 2nd choice would be the WL...unfortunately we're on a tight budget, so we're staying @ Port Orleans Riverside mansions, but if the right code comes along for the fall, you can bet we're switching to Poly!!