They are all obsolete and will no longer cut effectively. Larrin's new steel is now available:
CPM MagnaCut – The Next Breakthrough in Knife Steel
https://knifesteelnerds.com/2021/03/25/cpm-magnacut/
CPM MagnaCut – The Next Breakthrough in Knife Steel
https://knifesteelnerds.com/2021/03/25/cpm-magnacut/