Surely the key question is - is the capability difference between B and C material when measured against the current SAG scenarios?
I'd be surprised if the answer wasn't "choice of B/C doesn't affect campaign outcome", even if in some cases there are some minor advantages to one over the other (and vice versa perhaps). As such B/C doesn't really matter.
Seems to me the only real weakness with the B option is if it gets cancelled. This would be bad.