B&B, according to all reviews I read, is the theatrical cut. The material that was restored for the extended version looked quite poor on DVD, it wasn't good enough to use for a BD.
I have mixed emotions since those cut scenes were after the final cut. I'd like to see them re-restore if they can in the future, but it is nice to have the old version I'm used to again.
I'd say get the BD if you like the old pre-restoration version but save your DVD.