Poly to my bones, with GF a very close second and Gran Destino over at Coronado 3rd. Poly is just "home", it has the old school Disney vibe because of its history, gorgeous theming that really makes me feel I'm on vacation. It's laid back but has that energy too, being in the middle of it all. Most beautiful grounds of the resorts imo, we love to just walk around it. Most convenient of the monorail resorts from a transportation standpoint, given the proximity to TTC. The lobby smell, the music, the tiki torches, it all just transports you. I loved Aunty greeting us with a lei (RIP). And it's my favorite food resort, so many wonderful options outside the normal bland American fare you get at most other resorts (except AKL) and if you get tired of it you have fine dining a walk or monorail ride away. Nothing like getting a dole whip and watching fireworks and the EWP from the beach then walking back to the room. There is just nothing else that compares imo.
That said, I did not think any resort could ever match my beloved Poly but I had the most magical stay at the GF for my 40th last summer, truly wonderful. It is up there for me now. Yes it's crazy expensive and not truly luxe for the price, but I adored it and I didn't find it "stuffy" at all, CMs were phenomenal there. I know it must sound strange but I actually prefer the feature pool at the Grand to SAB...I am generally a quiet pool person and found the latter overwhelming and too crowded to really enjoy. I love the Oasis pool at the Poly for that reason too. They are very different resorts but I love them equally (the Poly is "our place" for me and my partner, which is why it gets the edge). Fortunately being next door to one another you get the best of both worlds.