For September I say BC for the pool, for Nov or Dec I say BW because I like that resort a little better than the BC and it's less likely to be as hot so the pool isn't as much a factor. However, if it is hot and you want to swim the BW has a perfectly nice pool, just not the same as SAB. Personally I would always choose a Disney resort over the S/D, but I would be perfectly happy in them if that's what worked out for a particular trip or if the price was right.
It wasn't in your poll, but I would pick the YC over the BC and then use time of year and price to choose between it and BW.