I would rank as follows:
1) BWV - easy to get to from anywhere in the resort, great slide, great pool bar
2) BCV - super pool, but huge and a hike from the BCVs. Gets a lot of points just because it is so unique and so much fun when you are there.
3) VWL - lovely pool, great theming, but is small
4) SSR - clean and new and fresh, but quite a hike
5) OKW - quite a hike and i find the calypso music very annoying after a while. pool itself is small, but slide is cool.