i like both <3 you can even mix the two
accidental especially, since it can cause so much alarm and intensity. caught in a closet, stuck in the shower, or in the middle of an opera. the deliberate one, to clear a path or start some noise, hehe, or to get revenge even. sneezing has all sorts of fun possibilities.
whether or not the sneezer tries to stop or lets it go, i'm okay with either. x3 i think trying to stop it adds to the aurora of fascination, i think.