Bone, is fine. Ive been carrying boine handled SJ'S for over 23 years, never broke one. Unless you plan on dropping it? I would go with the bone. Bone, stag, horn, etc. all are natural materials and will expand and shrink some (very little) with temp. change. You can use mineral oil, or a light oil on the handles to help keep them from cracking. Now I say you can use regular oil, as the handles on the amber bone are from light to medium dark, depending on the particular one you end up with ( I would not do this on natural bone, unless you do not care about "darkening" the handles, scales, etc. Than you would wna tto use mineral oil). There are dye lot variations with any colored bone handle and the amber ones really tend to differ allot.
If you want to darken the handles, then use a light oil.
If you tend to be really careless, drop, your knives, etc. go with the yellow comp.