For some reason BOOSTED331 can't get past the fact that we are talking about a completely stock engine(that means no head gasket) and pump gas(not C16).
So if a B18C5 can boost 12 PSI with it's compression(is that without a head gasket BTW?) and a C1 can handle 24 PSI with nitrous, I think it's safe to say the B18B1 can handle 20 PSI with a head gasket easily given some play because of it's weaker internals. So a C5 is boosting 12, B1 is boosting 20, they are going to make about the same HP, but the B1 will have more torque. So therefore the B1 is better stock for stock. Torque is king of the street.