SE H1. SE is tough, rust proof, easy to touch up/sharpen, great for outdoors and indoors, can handle cleaning neglect if outdoors for long periods of time..Note, LC200N PE may give this a serious run for the money for my uses, if offered in similar knives I currently use.
ZDP189, holds a very sharp edge a long time, my favorite for dragonfly. Personally do not have enough time and experience with other great edge retention steels to compare.
Third was a tough choice. I would say cts-xhp, based on experience with the chaparral. I have come to use it more than the knives/steels that are close or in the running. Could be just the thin blade, too, but it does hold up well.