Usually with different steels, there are trade offs. For example, with the steel that I believe the Boses use:

1) 440V - very tough, great edge holding, great corrosion resistance but, can't put a high polish on it and it is very difficult to sharpen without a grinder or diamond hones. It is also difficult to crink for certain patterns ("as per Reese yesterday). This is the toughest of the bunch.

2) D2 - great all around steel, holds an edge well, fairly straight forward to sharpen. Not as corrosion resistant as stainless but close. The CPM-D2 finishes very, very nicely as well. Not considered to be stainless generally.

3) ATS-34/CPM-154 - very similar to each other. Both hold an edge well (but not as well as 440v). Both are reasonably straight forward to sharpen and keep sharp. Both finish well, but CPM-154, being powdered steel based (as is 440v, CPM-D2), is very uniform in molecular composition therefore, more consistent in its properties. It takes a great polish. Nicely resistent to corrosion since they are stainless, etc.

Hope this helps.