I asked my 3 kids who are still awake (and who are supposed to be asleep, LOL!) and here are there answers:
DS14: OKW slide is themed better (sandcastle is cool) has lots of twists in it. BWV slide is longer than OKW but I still like OKW better. OKW rocks. I don't think anyone should be scared of the BWV slide, though.
DS12: Saratoga has better theming. It feels outdoorsy and relaxing, and is funner than OKW. OKW's kiddie pool is the lamest ever! SSR is way better for the little kids because the Donald stuff is fun for them plus they can play right in the big pool in the shallow part. BWV slide is better than OKW but not as good as SSR.
DS9: I really like OKW because it has the sauna in the lighthouse and I like being warm. I like BWV's pool because it has the roller coaster slide, which is better than the SSR's slide, but I like the SSR pool because they always play all sorts of fun games there. If you were say age 7 to 10 you'd like the BWV slide better. If you were like 4-6 you'd like the SSR slide a lot, and OKW is kinda in between, it doesn't really matter, it's still a good slide though.
So there you have it...