Well I love 'em all, but my favorite is probably s110v. I have actually kicked my zdp manbug out of my pocket (its my secondary knife) in favor of my s110v manix, it keeps cutting when others cant, and a sharp toothy edge is very effective in my trade as well. I have yet to try m4, 204p, 20cp, h1 and bd1, m4 seems like my kinda steel though.
(I havent used any old steels either like ats-34 & 55 or gin 1 etc)