Different types of airbrush
 

Looking over airbrushes I have noticed that one has a bottle underneath and one has the little cup at the top.

Are they used for different applications.

Cheers

They both do the same thing, but as far as I know, the gravity fed ones give more precision as they can use lower pressure and therefore do finer detail.
I've only used gravity fed rather than suction fed for doing body shells.
I have a big and dirty suction brush for doing my garden fence 😀

Thank you