What are the pros and cons of an air gun supply auto paint in front of a gravity feed principle for a painter?

I painted a couple of things in the past, but I'm getting more serious in it and want to know the pros and cons of both arms. I have always used channel air because that's what I had. But I always see something on TV that involves the painting of automobiles, which are using firearms gravity feed. Thanks in advance.

I think the severity of food provides better quality paint job, but also depends on how you have set. My dad has a paint gun siphon that works well, but I think the best gravity feed.

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