I love BWI, BC and YC, and am currently changing my resort choice for the PHM every 15 minutes. (Also love Poly, and considering trying GF, so it's a real mess right now!)
Pools/slides: I do prefer the BWI slide because it's not enclosed and a ton of fun. It's also right there, so no need to cross the path and disappear on the other side of the pirate ship. I prefer SAB overall (I find it less crowded than Luna Park because there is so much more space at SAB.) As for quiet pools, I prefer the BWI quiet pool because it's entirely enclosed by the courtyard and the hot tub is super clean and in very good condition.
Dining: BC Marketplace is very convenient and has been far less hectic than the Boardwalk Bakery, but BB was under construction during our last visit, so things may have changed. Hurricane Hanna's offers far more than the bar at the Luna Park pool and the setting is more pleasant. SO happy that both BWI and BC offer self-serve refill mug stations - yay!
CL: I prefer the food at BC, but the lounge space at BWI is more comfortable with the high ceilings and long layout of the room.
Views: The water/boardwalk views at BWI are literally right on the water. I definitely prefer the view of BC/YC (with MK fireworks) from BWI over the view of BWI from BC/YC. Some don't like the close proximity to the Boardwalk, but I like it - most of the time, it's quiet with relaxing music. Just a few exceptions - like when the squeaky performer is out there.
Etc: I prefer the decor, music, lobby and theming at BC. But it's not all that different at BWI.
As for me, I still need to make a decision!