Dec. is very very popular w/ DVC bookings, the 360 Poly studios should be easiest to book, next easiest would be the 202 resort studios in the newly converted BPK building at the VGF - but you’ll still likely need home resort booking priority for Dec. for both resorts. I suspect the 47 deluxe studios in the original VGF building will be booked really fast especially since some of those studios will be taken by 2 br. lock off bookings.
For a 20th anniversary splurge I’d probably opt for a 1 br. in the original VGF building w/ the king bed in the master & the lovely bubbler tub & I’d book it at 11 months (so next month

.)
Regarding construction noise, we were just in the original VGF building this Dec. & didn’t hear any Poly construction - although we could sort of see it from our balcony.
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The first image is from the boat showing that the Poly construction zone ends right by the GF wedding chapel. The second is from our balcony - the crane in the distance is the Poly construction.