Many moons ago I was the UK publisher of an airbrushing magazine. Last year when I was in the UK I met a couple of the artists from those days and they both still practice the art. They both still use Badger airbrushes, primarily because of the interchangeability between cup and, for bigger areas, reservoir. Badger has always been rated as one of the best but I cannot comment on the new makes that seem to be around nowadays. The rule always seemed to be to buy the best one can afford and the quality of the product shows in the final work. I just had a quick look at a top 10 review and Badgers are number 4, unfortunately I have no experience of the three above.
Air canisters are available but the air supply is never as consistent as with a little, indoor compressor particularly as the quantity of air contained reduces.
Hope that helps.
Regards,
Rodger