Two different types? Didn't you see the list of September releases?
There's two variants of the Damascus Shallot, and a Rainbow Shallot, on top of the two CB shallots, and the already released black, and standard model Shallot.
That's a total of six Shallots that will be available next moth.
I'm going on a Shallot-ganza! (I apologize to any Busse Hogs if this is inappropriate use of their terminology).
The difference between ZDP-189 and CPM S110V? Well, first off ZDP-189 is a Japanese steel made by Hitachi, and CPM S110V is made by Crucible in the U.S.
Both should be fairly hard, ZDP-189 is a super high alloy super wear resistant steel, usually run between Rc 64 and Rc 66 (most good steel types work best around Rc 60, but keep in mind that they are all at least a little different). CPM S110V is a sort of upgrade of CPM S90V. It was probably developed because the ill fated CPM S125V was too difficult to work with, so S110V should be a happy medium (between incredible performance and the ability to make anything out of it).
CPM S110V is supposed to get a bump up in hardness, though Kershaw is the first to use this steel type so they'll be setting the standard for the steel with this run. I'm hoping for Rc 63+, but whatever they do it'll be one sweet steel.
Being an upgrade of S90V, we can probably expect S110V to perform similarly, only a little tougher, sharper (higher hardness allows thinner edges) and more stain resistant. S90V is already a bit more wear resistant than ZDP-189, so S110V should be a bit better all around comparatively.
