I hate to bring this up, but perhaps the top "USER" knifemaker in the world just recently passed on. I think most would put him in the user and not the beauty queen category, since those are the choices you've created to select from. Who would it be? Bob Loveless, of course.
Just trying to make a point - you're going to get lots of different answers because of your category limitations. But as written, I would need to say that Bob Loveless was the best maker of "users" the world has yet to see. But they are highly collectible and therefore extremely expensive.
EDIT: Let me add that, IMHO, Loveless knives are the height of subtle beauty and purity of design.