one accepts the stock knob, and has a round lever, very similar to the stocker. one has a flat lever that accepts the HURST handle and knob. the other shold be the billet version. that one will have a large billet mounting arm, and will look much beefier than the others. i have never seen one of the billet version available. advertised, but never available. B&M bought out HURST, so the manufacturing of the billet version as on the back burner during the transition.
Chris from B&M (user name here is subzero05) should be able to tell you more about the B&M/HURST delays).
the ford racing one i believe is the first one, that accepts the stock handle. as far as i know, they all function the same and have the same amount of throw.