Well, I can only comment on what I have, but here's my .02....
I have two Queens in D2, an initial pain to put an acceptable edge on, but are now stellar performers.
My third stockman is the humble carbon series from Camillus. Has 1095 steel with Delrin handles. She ain't a looker, but the steel sharpens easily, holds it's edge for quite a while, and is a value to boot. I'm carrying her today!
All in all, my favorite pattern. I would stick with either D2 or carbon steel, but that is just my personal preference.
Good luck,
Mongo