The same objective is achieved, but the B2 crew don't see the target whereas the UAV crew do.
The B2 crew have at least put themselves in some sort of endangered position. Not much, I agree, but at least they have accepted some risk to carry out their mission.
Throughout the history of warfare, valour has been applauded and celebrated. Once there is no more valour in warfare, where would it end? We already deride "terrorists" for their "cowardly" use of IEDs and bombs - so if we also retaliate without risk to ourselves how will we ever win?