I'm an enamel guy mostly. I often do models that require gloss finishes, and find that too hard to do with acrylics. Also, have had acrylics dry too fast in my airbrush, and don't want to bother experimenting with retarder. I like MM because of the color selection.
I have used acrylics to make sure I could still paint, after hearing rumor of disappearance of enamels, but as long as they are still around I will use them.
I find enamels brush as well as they spray.