The BB2 and SC sound very different from the Two10. I used to have a couple of BB2, and now I have a single Two10 (with another one to be added in the future). I find the Two10 much more to my liking than the BB2, which is not a bad cab at all, but while I merely liked the BB2 and enjoyed the power and portability, with the Two10 I enjoy the sound a lot more (purely personal preference). If you really like the sound of your 2x One10, I'd just get a Two10. The Two10 is also easier to handle and carry than the BB2. The shape makes it feel less bulky.
I prefer the Two10 by a long way. But that's just me. It doesn't feel like a compromise in any way.