The CRANE has a fixed rubber pad the others do not.
The pad allows for solid contact even at angles that are not ideal. The others changed the geometry to try to fit best into the "shoulder" of shooters.
IF you dont shoot in Tac gear - the geometery of the other stocks may not be ideal, and you may appreciate the LMT/Crane more.
I've sprayed rubberized rocker panel guard on the end of my Magpul M93's to give better grip on nylon.
I've shot with the Magpul M93, Magpul CTR (pics up later in the week), Crane, Vltor (clubfoot, carbine and the fixed ones) Colt M4, Colt M4 Waffle (the one above) and some others.
I would have to say it is personal preference, how you shoot, what you wear when you shoot -- and how much you want to spend.
Operationally I've run the Magpul M93, VLTOR, CRANE and issue M4 stock -- I dont feel hurt by using any -- I prefer the M93 but that is me.