Carbon steel or stainless steel for a bushcraft knife?

It is a genuine trade-off. Carbon steel (as in the Morakniv Companion Heavy Duty and the BPSKNIVES models) takes a keen edge and sparks well off a firesteel but rusts if not maintained. Stainless (the standard Morakniv Companion and Kansbol) is more forgiving in wet, low-maintenance use but is generally regarded as slightly less easy to get screaming sharp. Buyers who batoning or process a lot of wood lean carbon; campers who want low upkeep lean stainless.