That's so hard to answer. We like them for different reasons. We love the rooms and relaxing atmosphere at OKW. When we are staying for at least a week (just our family--no stragglers) we like OKW. When we are staying with family or other people, we like BCV/BWV area because it's easier to hook up with people, or some can wait outside while waiting for others. WLV wins the theming contest hands down. And, interestingly, WLV is my kids' (8, 5, 1) favorite. They like being close to MK, and they love spending non-park time at the contemporary and Ft. Wilderness.
The only one we'll probably never book again--unless we can't get BCV--is the boardwalk. There are a few reasons--kids hate "that clown thing", a little noisy for us, we don't eat out so restaurants aren't a draw, my dad died on one visit there, we got the "cruise ship flu" on another trip after sick cruisers arrived at the hotel, etc. etc. etc. Obviously, some of the reasons are personal. And if the BCV didn't exist we'd probably go once in a while.
For two adults, I would think BCV or WLV.
Jenny