Since you know the pros and cons of both Poly and BC, I'll list a few things that stand out to our family:
POLY:
> watch Wishes right from the main pool, the beach, and several other parts of the resort.
> have Kona pressed coffee.
> have tonga toast for breakfast.
> dinner at Ohana. Or twilight feast instead (Ohana dinner delivered to your room).
> Dole whip stand right at Poly.
> monorail to both MK and Epcot.
> boat to MK.
> walking path to GF.
BC:
> main pool is amazing, lots of different sections to enjoy.
> rooms are "fresher" (more recently refurbished) than rooms at Poly.
> walk to Epcot in just a few minutes.
> walk or boat to HS.
> surrey bike rental/route is beautiful around the water.
> boardwalk is fun, including ESPN Club.
> walk to mini-golf course.
> Beaches & Cream is fun restaurant for various ice cream treats.
Perhaps pick the one that you think will suit your DH best. Either way, they're 2 of our favorite resorts! We've stayed at both several times.