OKW is our home resort and for use we love it. Because there are 6 of us we have to drive to Disney and nothing beats being able to park our car right outside our building for easy access. Boardwalk to us feels like a large hotel. We've only stayed at BWV once, but this is how our experience went. We had a BW view on one of the top couple floors so we had a GREAT view, but after a long day in the park we'd ride the bus back to BWV, enter the front door, ride the elevator up, and then the hike continued as our room was one of the last 1 or 2 on a WING, which is quite the walk with 3 kids (at that time) after touring the park. Now I will tell you that my friend is a BWV owner and for their family they like it over OKW because they don't like their doors opening towards the outside (mosquitos and things attracted to porch lights), so for them they preferred BWV over OKW. But for us we like being closer to our car or a bus stop vs that hike it took us to get to our room within BWV. The pool/slide is probably nicer at BWV as the slide at OKW was added, where BWV the pool was designed around the slide, but our kids had plenty of fun in the pool.
This is just our .02 to add to all the others you've already heard (room sizes, balconies, washer/dryers, etc.)