If I had to choose one over the other I would opt for the pedestal because of the mobility factor. I tie everything from midges to 4/0 saltwater flies on my Rennzetti travler and if I need to really hold down the vice I sometimes take a small C-clamp and clamp the base to my tying table. The travler has gone many places with me and I've never felt that a clamp type vice would be better than what I have now. If there is a downside I would have to say that it would be height adjustment. A clamp-on can be adjusted for a more ergonamic tying posture whereas you have to adjust table height or your chair to get comfortable for a long tying session.