How funny! DH, DS (11), DD (5) and I are going at the end of July. I was debating the exact same thing. Landed on BWV and made my ressies yesterday! Since we weren't doing parks either, I thought it would be great to have the evening activity and lots of things to do at the BW. I also have read where the pool is incredible. DD can partially swim, so I'll take her life jacket and the depth of the water won't matter. Some say the water is deep there?
I'm sure you'll have a great time at either resort! Wouldn't it be great if all of our decisions in life were as tough as deciding which resort to reserve??? Ahhh....