Boardwalk, for sure. We bought here in 2000. Our children, now 19 years old (twins) LOVE this area, and have loved it since we bought here. ESPN is very important to both of them, they like to watch the games and play in the arcade. They also love being able to go to Beaches and Cream at the Beach Club across the way, and they love the boardwalk bakery, pizza window, and sweet shoppe. In another year and a half they'll be able to go into Jellyrolls with us and add some more fun to the Boardwalk area, as well as being able to go to the only club left on property (DTD closed the clubs), Atlantic Dance Hall - 21 to enter. They also love the slide at the pool, it's long enough and big enough for adults, and being that they are still kids at heart (for a long time to come

) they enjoy using it. They also like the fact that there's mini golf just up the road (walking distance).
They only downfall to buying here is that it expires in 2042, whereas SSR and AKV expire in 2057 (anyone out there please correct me if I'm wrong).
However, since first buying in 2000, we've added on at BW twice, and part of me wishes my recent AKV (although I absolutely LOVE this resort) add on was also at the BW. It's just really our favorite place.
BTW, DTD is a short cab ride from BW, which is the preferred mode of transportation to get there for us. The bus is good too, but stops at the other Epcot area resorts as well. Cab is 5/6 minutes to DTD from BW.
Good luck with your decision.