All these tech are getting me dizzy. All I know is that the Velocity has changed the way I spray. With the Cresendo, I'll put 2 layers on a surface. 3 at most if I'm is the right mood.
With the Velocity, I'll put 4-6 layers of different shades on a surface. And more if I need to since each layer is so thin and dries almost immediately. The result is that the eye sees 4-6 shades of the same color. I think this is what the Euros have been doing for years and we Americans are starting to catch up.
In addition, I'm not afraid to screw up the paint job. Because each paint layer is so thin, I can just spray over any mistakes without having to sand the painted surface down. I think this is called accidental pre-shading. The fixed accident often looks better than a perfectly sprayed spot.
In the end, spraying is actually more "fun" than handbrushing. This is something I thought I would never say. Anyways, I really like the Velocity. And nowadays, I have a tendency to rush through a built job asap so that I can fool around with airbrushing.