I'm afraid I am no help here when it comes to steel, but I can give an honest opinion on axis locks vs linerlocks.
I'd give this one some long hard thought RE: steel, and how important it really is, and some time with an axis equipped BM.
A quick check on old D2/M2 threads would probably show that the pro's and cons of any 2 comparable steels is so even one way or another that it hardly matters which you pick....with one you may have better edge holding, but more chip-prone, one rusts, one won't, one sucks to sharpen, the other doesn't etc etc.
Personally, steel has dropped on my list of importance over time compared to ease/fun to use factor, that pretty well determines which knives get carried most in the end, for me it does anyways. My 440c BM556 has pretty-well ousted all others from my EDC lineup, including a long-time personal favorite, an old CRKT Apache ats-34 linerlock which I really dug.
one loud vote for the hopelessly addictive Axis lock here!
Just my measley .02