I started model building at 5 or 6 years old. I wasn't allowed paints back then, and when I could have them it was with a paint brush. From there to rattle can. I started working with an air brush about 16 years ago, then took a 14 year break. The air brush I had then worked off of a air can, and was not much better than a rattle can, but I could mix the color. I still have that air brush, but it isn't used any more.
I got back into this about a year ago. My first completed model was painted with a air brush (paasche VL), and my contest entry is part rattle can and part airbrush. The rattle can part gave me much trouble. So I am going to take some time and work with the air brush. It was much better at putting down an even coat of paint. I just have to learn how to control it better, and clean it up. (Got a nice crust of enamel paint on the needle right now. When I bought the air brush, I also bought a cleaning kit, time to find it.)
I am more comfortable with a real brush than an air brush, and will brush paint any area where I know strokes won't show. I spent a good 10 years of my younger life with a paint brush in hand, so that really isn't a surprise. I am just reviving an much earlier learned skill set, while with the air brush it is all new.