BTW, to answer your questions--Stainless is much easier to maintain but it can corrode. If you can sharpen a knife, either steel is good.
The 5.5" blade is much more popular with airmen for obvious reasons--much more compact and easier to carry but still a very stout blade that can be counted on.
Sawteeth are cut for metals and/or plexiglass type substances, no offset kerf for wood. Even with a 7.5" blade there's not much saw to work with.
Knurling on the handle looks good in a display case but most of the actually used/carried knives I've owned have had paracord, snare wire, fishing line, etc wrapped around the handle and one or two were wrapped with tape over that to keep it in place. Now days, with the popularity of paracord slings, belts, bracelets (LOL!) there are other options for having some handy but wrapping the handle with cord and stashing some fishing line and hooks, matches, water purification tablets, etc in the handle is still a worthwhile precaution for an actual using knife.