This is from the outlook of a maker and a steel lover. In Stainless Steel I gotta vote for BG42. It takes such a wonderfully agressive edge, is still sharpenable by normal humans, and takes a terrific finish. In fact, ATS34 is very similar, and a little easier to sharpen.
The particle metallurgy steels are interesting, but leave me a little cold. Sure they are hard, but at what point are we just getting lost in specmanship? And it seems at this point technology is getting us away from the fundamental nature of the iron and steel mix.
In carbon steel, O1 takes an amazingly, even comicly keen edge. I make wood carving knives out of O1 and my leather cutting knives are O1. Man, can I ever shave wood and leather with these knives. O1 and L6 in damascus makes a purely remarkable, but not maintenence free, blade.
Talonite? Couldn't care less. I got into this game due to my continuing amazement with the properties of steel. Talonite isn't steel, and frankly, has no charm (IMHO, of course

).
Gee, I sound like a Luddite, guess I'd better go back to lurking.