Heat treat and blade geometry are more important than the numbers and letters (type of steel) etched on a knife. In regards to edge retention, Mr. Ankerson did a great job of testing more steels than I even knew existed. I remember the Cold Steel Ultimate Hunter in cts-Xhp performing better than many blades in m390. On paper, Xhp should not have higher edge retention than m390. I guess what I'm trying to say is that there are so many variables in the overall performance of a given steel.
Ergonomics are more important consideration for me when purchasing a knife. My aging hands fatigue quickly with certain handle contours. So my initial focus is on the ergos. I do not have the skills to make scales to my liking.