Very valid point.IMHO, more important than what weapon is to have a plan.
Another angle that's worth mentioning here is that if you use a gun to kill a grizz in self defense, whatever kind of trip you're doing is almost certainly over immediately and you get to spend the rest of it doing paperwork. If you use spray, which, again, is the most effective way to handle the majority of bear encounters, then the bear walks off having learned a lesson and you get to enjoy the rest of your trip.
Just something to think about.