These three resorts are fabulous! The short answer is, you can't go wrong with any of them! I have stayed in all three, and I am a newbie DVC owner at GF, but I love Poly and CR too! I think if I were forced to rank them, I would rank them this way: GF, CR, Poly.
GF pros: the whole resort is so pretty, and (when the walkway is open) you can walk to MK. Rooms are huge and both pools are really nice. We love the restaurant choices here: Gasperillas, GF Cafe, Citricos, and The Enchanted Rose are all fantastic.
CR pros: hello...monorail running through the main concourse...so DISNEY! We actually like the garden rooms better than rooms in the tower. It's only a 2 minute covered walk to the main concourse and the garden rooms are cheaper and way more quiet. We enjoyed sitting on our patio and watching the electrical water parade float by our room each night. Steakhouse 71 and California Grill are great restaurant choices, and the Contempo Cafe is my most favorite quick service place anywhere on property. Walking to MK is awesome.
Poly: Captain Hook's is a solid quick service option. The pools win in terms of theming and vibe IMO between the three monorail resorts, and the Moana retheme is terrific! Quick walk to TTC gets you on your way to Epcot, which is a bonus!
Have a magical trip OP!