We have stayed at all of the deluxes. Our favorites have actually changed over time as our priorities change. But one thing that has stayed the same is we like relaxing resorts and we like resorts with either walking paths to parks or monorail to parks. Our favorites are Poly, GF, and BC, probably in that order.
BC used to be at the top when my kids were young and slept in cribs and even when they were toddlers and didn't take up much room in bed. Now, though, we need a daybed for sure and that's only a request at BC. Also, a full balcony (preferably with a nice view) has become a "must" for us, and that's also only a request at BC. But if neither of those issues affect your family, then BC would be a golden pick for a vacation with a lot of resort time. Besides the awesome pool, we used to spend a lot of time on the boardwalk, loved renting the surrey bikes there, loved watching Illuminations from the bridge, enjoyed Beaches & Cream for a variety of ice cream treats, went in ESPN Club quite a lot....walked to mini golf too.
However, our current favorite relaxing resorts are Poly and GF. We are guaranteed a daybed and pretty much guaranteed a full balcony with a nice view at both of those resorts. We love the walking path between them, and it's so easy to visit the other one. There is great shopping and restaurants at both. Great views of Wishes at both. Pool cabanas are available at both resorts, though Poly's cabanas are at the quiet pool and not really private like the old ones used to be. And we do like being so close to MK as that is our favorite park nowadays.