I use a little bit of everything.
carbon steels I use 1075, 1095, 5160, A2, D2 and CPM 3V. For stainless I like CPM
154 and 154CM. For the most part, I use A2, D2 and 3V as my main carbon steels and Stainless only when I have to :) I am always on the
lookout for new and better materials so if I find something I like, I
try it out. I send A2, D2, 3V and stainless out for professional heat treat
and cryogenic tempering. I treat 1095, 5160 and O1 in my shop.