the major differences:
both 1bdrms have a king in master, queen-size sofabed in L/R. OKW 1bdrms are 942 SF total, full laundry room, and also have a sleeper chair. BWV 1 bdrm are 712 SF, with stackable laundry unit (in closet).
OKW: one can take a boat to DTD (or about a 1mile walk), and buses/drive to parks. some buildings do not have elevators. Hospitality House units (a booking category) are usually most desirable, else you would need to walk/bus/drive to the main pool, dine, shop at the general store. you can park outside of your unit at almost all buildings (we actually dislike that aspect - the fumes of cars & buses aggravated my asthma, and prefer not seeing and hearing cars/buses on vacation).
BWV: 2 parks are within walking distance: EPCOT (about 5-10 minutes) and DHS (about 15-20), or take a friendship (we prefer the very pretty, short walks). there are restaurants (ESPN, Flying Fish, Big river Grille), as well as a bakery (yum!), ice cream/sweet shoppe, jellyrolls (dueling piano bar), and nighttime entertainment (carny games, surrey bikes, street performers such as magicians) directly on the BW. there is only 1 elevator bank at the BWVs, but many stairwells (which we prefer to use). BW view

cloud9

and standard views each only account for 20% of resort, are only bookable on points (no cash) - and go quickly. waitlisting helps
sooooo
OKW: large spread-out resort, with HUGE rooms, and an extra sleeping area.
BWV: much smaller resort, with short walks to 2 parks, lots to see/do at your fingertips.