The "pool" you saw by the pirate ship has a sand bottom, many different areas to it, the pirate ship is a slide, and there is a very deep lazy river through it. For myself, I wouldn't stay at BCV for the pool, although many, many, MANY people do! Lot's of folks just love it! My little grandkids (ages 4 & 6) loved the kiddie part with the sand bottom. They also liked the small slide on the other side of the ship. What I like about BCV is it's closeness to Epcot. I love Epcot and love being able to walk there. If you are getting a studio and using Disney transportation, I would choose BCV. If you will have a car and will need a 1BR or larger I would go for OKW. We stay at OKW most of the time because we like the laid back feel of it, and the fact that we frequently have the quiet pool to ourselves, and it's very convenient for us to step outside the door and get into our car and drive to where ever we need to go. And my husband likes the slide at OKW better than the one at BCV...although the BCV slide is much faster!
My 2 cents...
Lori