Both Yost and Wilton are very good vises. I would lean toward Wilton in some applications due to the enclosed clamp screw. For other applications I would lean toward the Yost. I have both in a Wilton C2 and a Yost 33C. Great American Iron. The Yost is made from 65,000 psi ductile iron.
Even the new products are very good.
Thanks for the input, also new vs. old comments appreciated.
Rgds, D.