Having looked at both and owning a vepr12, vepr all the way. The gun is a tank.Personally I'd get a semi auto like a Saiga or Vepr if I'm paying over $500
One possible advantage to the KSG is the dual magazine tubes. You could theoretically load one with buck and one with slugs - there's a thumb switch up above the grip that'll let you choose between the two.
Pfft, when you are dropping mattress disposers with a 12g buckshot to the head, the heat of the shell on your arm just sears in the memory of it all.That is first what attracted me. But, the rear eject into your support arm with a hot brass ejected shell made for a bad day for me.
I might buy one if the action could be slicked up. You really have to rack that thing with some force.