I do not really have a favorite. I carry one or two knives from my collection every day, and rotate them when I feel the need. I carry flats, convex, hollow, whatever. On any given day I could have one knife with 440A and another with CPM S30V.
Today, and for the past couple of days it has been a Cold Steel Black Rhino {Japanese AUS-8A) and an old beat up Kershaw Leek (440A).
Since I usually have a DMT Diafold somewhere close by, the steel type is irrelevant.
I will tell you what I do not like. Chisel grinds.:barf:
Don't have any now, never will.