My favourite steel is also d2 currently. I don't have any experience with the newer supersteels. I've got quite a few d2 blades and find myself wanting to try something different.
I'm very anxious to try some out and would love for one of my next knives to be a Darrel Ralph.
I know I want a flipper, probably with some form of bearings, I don't care if it's speed assisted or not. A cutting edge steel would be a huge plus.
I consistently find myself loving Darrel's designs more than others.
I'm super excited about m390, but i'd try out elmax too given the chance.