I would look at your use patterns over the life of the contract and decide where you will end up spending the most time. Some important things to consider besides pools:
BCV, BWV- proximity to Epcot and MGM, Boardwalk
VWL- proximity to MK, Holiday theming
OKW- Larger units, lower point structure and dues
SSR- proximity to DTD, middle point structure and dues, longer contract life
We actually ended up buying through Disney for SSR. Our main concern was the longer contract. We are in our mid-twenties, so the longer contract was enticing. Plus, SSR's dues weren't as high as BCV, BWV and VWL. We will primarily travel in the summer since I am going back to school to be a teacher, which isn't an extremely busy time for
DVC. Hopefully we will have no problems trying out the other resorts and if there is no availibility, I am more than happy with SSR. Make a decision that will fit your family for the life of the contract, not just the first few years.