The AUS-6 and AUS-8 Steels are the improved Japanese versions of 440A and 440B respectively. The improvement involved adding a very small amount of Vanadium, which acts as a grain refiner and hardener, and improves edge holding. The Choice is up to you, I don't have any experience with either steel. As far as Bear's damascus goes, can't find any reference at their webpages what steels they are pattern welding to produce what they sell. I do know it's a high carbon damascus, which I wouldn't want personally in a hard use knife. The etched pattern wouldn't probably hold up too awfully well under hard use and constant abrasion, and what little I've messed with the stuff, you're not gaining any kind of edge advantage with it. Not having used any of the products/steels, I can just pass on this little node of knowledge(heh!)