Hey Hurricane29,
Of course the pros of having an airbrush are:
Unlimited custom colors, just mix paints
Not much mess, just look at the spray site after painting witha spray can
Freehand camoflage
The cons are the learning curve and cleaning it. Some airbrushes are easy to clean,like Testor's Aztek. Just unscrew the paint tip on it and wash it out.
whatever you do, an airbrush will improve your skills.