The other thing I should have mentioned when comparing the Runway 13 airbrush with the Badger 155. The Runway 13 takes its paint from a reservoir on top while the Badger takes its paint from a hole in the bottom which sucks it up from a cup or jar. When I'm painting something like a white-all-over 747 I'm stopping continually to fill up the reservoir while when doing it with the Badger I just fill up the big jar and away I go. So there's that convenience issue there too.
Still, I think that we all end up favouring the airbrush that works best for us, though why one works better for one person and another works better for the other person is a mystery.