As the original poster, thanks for everyone's thoughts. It wasn't my intent to invite people to bash either resort. I had asked about the dislikes because I've found that whatever big purchase item we get (house, car etc.) that after time we end up taking the big positives for granted, and only notice the negatives even if they are minimal.
I realize we would be taking a risk by not having stayed at either, but judging by everyone's comments (including a close friend in a similar family situation as us, who always stays at BC), and having visited the Boardwalk/Epcot before (without staying there) we really can't go wrong with either. We've only stayed at AKV and HH before - while the kids love AKV and AK because they like 'saving the baby elephant' during the Safari, I can't see them wanting to be close to AK for that reason when they're teenagers.
The point about the lack of dedicated 2-BR will be a big point for us. At HH I had two of the kids stay in the room with the 2 queens, and the third stayed on the pull-out (at her specific request!). The two sharing the room would have an issue sharing one bed (they're twins, so they fight over everything!). The other big issue will be the proximity to parking. The views at BCV (or lack thereof) won't be a huge issue. While the need to keep a close eye on the kids at SAB will limit us from relaxing as much as possible for the first few years, hopefully it won't be as much as a deal when they're older.
Thanks everyone for helping. Would love to hear more opinions if you have them!