I'll second the notion that brand loyalty runs high, the old Chevy/Ford issue. I've used AB's from 5 different companies, none were bad, but a few did perform much more to my liking.
My two front runners are Badger and Iwata, both stellar performers. Iwata is much more expensive, I find they do not perform any noticeable amount better than Badger, so Badger is my mainstay now.
The Badger line seems to me to be more robust, the parts are more substantial and less prone to handling damage, plus the parts replacement costs are MUCH lower, when routine maintenance of heavily used AB's is completed.
An important Badger feature that I have learned about is factory service, if needed. Quick turn so you aren't without your airbrush for long, very reasonable repair costs as well.
Don's Airbrush website gets my strongest recommendation, most of my airbrush knowledge came from there, (not that I know so darned much.) Good luck with your search.
Patrick