Well, in some ways, it's the same place really. It's run by the same company, with (as far as I'm aware) the same Editor and with common membership (i.e. you can use your AB login details on SAB).
However I'm surprised that SAB still exists. At one time clicking on 'Sport', here on AB, automatically took you into SAB but the Editor decided that having 'Sport' simply as a subsection of AB was a better idea.
That leaves SAB as a 'rogue element' of AB, because it's largely unmoderated. (i.e. the Ed can still deal with problems but AB's moderators, like me, don't have the ability to suspend or ban people on SAB).
I'm kept busy enough (answering questions and occasionally 'zapping' people) here, without wanting to get involved in SAB!