Both resorts are wonderful. The only possible construction at the Poly in November would be refurbishment to the quiet pool, everything else should be completed by then. We have a stay booked for August, hoping to enjoy our favorite resort finally construction free! Our last visit was October 2013 when the mess had just started...
We stayed at GF last June and have another planned for this June. At GF, you receive nightly turndown service (plus new towels and chocolate) in all rooms (not just club). Gasparilla's also has more seating and a larger menu than Capt. Cooks at the Poly. But GF is the last stop for the monorail and shared buses to the other parks, so getting seats first thing in the morning can be difficult. At the Poly, you can walk to the TTC and catch the monorail to Epcot.
Since there are pros/cons for each, it may come down to your theme preference...Island or Victorian?