I think they pretty different knives. I have both on my want list. The Freemont Jack seems pretty burly but has a short cutting edge. The Viper looks like a great slicer and very sleek but I'm not sure if I would like the swayback handle shape. They both look very pinchable but I wish the Freemont didn't have that huge swedge radius. Viper blade in Freemont handle would be a sweet knife.