For starters, American-made means nothing to me - I'm in Canada, so all these airbrushes are foreign-made to me; all I care about is what will be doing the better job.
More importantly, up here in Toronto the only big place that carries Badger equipment is Micheal's, and their selection of stock is quite inferior - and coupled with that, they dont have any staff knowledgeable about airbrushes. Iwata and Paasche, however, are sold by the big art supply stores, so I will have access to a greater selection of parts/accessories and (hopefully) educated staff.