Mike,
It's easier to point the Sotar. I can use more wrist to go around small angles. I think it's because the weight is on the ends of the Velocity, but you have to be more careful when using your wrist when spraying with the Velocity. The Sotar is more of an extension of your hand rather than a piece of metal in your hand.
The trigger on the Sotar is far more responsive. And more importantly, it's far more consistent. I could control air with the trigger. Can't dot that with the Velocity. I tried polishing the Velocity trigger several times. But after some use, there's still a little catch as though the tigger didn't fit the brush as well. With the Velocity, it's more of an "all or nothing pull." I could really play with the Sotar trigger.
It's also easier to do a pencil line with zero overspray. And if I do it on the Velocity, I need to really get close to the surface. With the Sotar, I could do it 1 inch from the model. This is important because I need to see where I'm spraying without the brush blocking my view. And when drawing the outlines to a camo, it comes out smoother.
Speaking of which, not only is the cup smaller so I can see over it on the Sotar, it's a better design. Paint flows into the brush better. When paint gets low and I'm spraying at odd angles, the curve of the Velocity cup sometimes catches the paint rather than spray it. With the Sotar, if there's paint left, it's getting spraid.
We can dance around statistics, numbers and testimonies forever. But all I know is that when I'm doing details, I put down the Velocity. And I pick up the Sotar because I trust it more.