The most important feature I would like in a using knife is for it to be able to cut well and hold its edge. I've found this quality in the knives of Phill Hartsfield and Bob Dozier.
The most important feature for collecting I look for is fit and finisj, such as in the works of you, RJ Martin, Pat Crawford, Bud Nealy, Ankrom, Osbourne, Ralph, and many others.