Oh, this is a hard one. I've stayed at both and would not hesitate to stay at either again. My personal favorite is WL, always has been always will be. I love the atmosphere, architecture, and overall feeling there. I will say that the pool is not very special. It does have a slide and 2 spas. They have a convenient fast food, Roaring Forks, area. It is close to MK and it is an easy ride to the Contemporary and Fort Wilderness.
I have also really enjoyed BC. If your kids want to spend a lot of time at a pool, Stormalong Bay would be fantastic. The decor at this resort is very clean looking-a lot of white with nice color combinations. Their fast food is Beaches and Cream, its a nice 'little' place, often busy and sometimes you have a wait. You have easy transportation to WDStudios and Epcot. If you like to get out in the evening and walk or look around, you have a large area to do this by walking over to Boardwalk. It is fun to rent the surrey bikes and ride around the area too. I think you'll enjoy either resort, whichever one you choose.