I have had all three steels, or DO have all three steels. Z-Wear is nearly the same composition as CPM Cru-Wear, Z-Tuff is tougher than Z-Wear, but has less wear resistance, though it will have slightly better corrosion resistance too. Z-Finit(also called LC200N) is a tough nitrogen stainless steel with less wear resistance, but is quite tough! None of them are proprietary steel by MBB. All of the knives I own in these steels are not from them, their blades are a little too thick-stock for my taste. If it was a chopper I'd go with Z-Tuff, if it was smaller than 8 inch blade I'd go with Z-Wear. Unless you NEED corrosion resistance, then go for stainless, otherwise, the other two have good enough corrosion resistance. IMHO