BC hands down, Stormalong bay pool is fantastic, unlike the previous poster, in all my times staying there I have never been there when I would call it crazy busy, and I was just there in September/October when it was very hot (95+) and humid. The more shallow kids area was a bit more crowded, but the lazy river, slide, and deeper areas were great. My husband had a work conference after I left and moved from the YC to POR, and although he loved how serene the resort was (it is his favorite moderate) he did notice that the room he was in was in need of a refurb, especially as compared to the brand new YC room he just left.
The Boardwalk is also really nice though, and has a great location, I just don't personally prefer how it is laid out, nor the pool and dining options on that side of the lake when compared to Y&B.