I'm using a Badger 105 Patriot with a larger paint cup. It's a double action. I like it, it sprays broad but can do some fine work. I also have a Badger. 360 Omni which I would call a 105 brush with the trick o having the barrel rotatable so that it is either a small gravity feed or siphon feed. The siphon feed is handy when you need a volume of paint from a bottle (200 scale hulls). I have a Sotar 20/20 which I think I've used twice on aircraft.
I Learned to airbrush using a 20 dollar Harbor Freight dual action special. It was good for its purpose, a cheap learner. I learned mixing and air pressure and spray techniques, but I found it had it limits. Now I only use it for things like spraying Future.
I like Badger, American made and their brushes have a lifetime warranty. Return them to Badger to be fixed or tuned up. Labor is free, parts are 60% off. You do need to pay shipping both ways