Both types of skulls are valued, of course. And, again, though there would certainly be cultural and at least some religious differences, humans and orcs pushed to the sort of land where semi-nomadic is about as "settled" as they can get, again, due to resources, impassible mountains in one direction, "here there be worse than dragons" on the second, walled off from an empire on the others (who also basically control trade access), humans and orcs probably would have more similarities than difference, although how friendly either is somewhat clan dependent on both sides. Realistically, how much conflict and brutality the two species would have would grow and ebb depending on how fierce the struggle for limited resources is, and more abundant years would be good for peace, etc.
I don't need to go into excruciating detail, but I do like to try and think of what sort of fantasy culture would evolve under certain conditions. Specifically, I want to avoid whole-cloth real world transplants, particularly for those I'm not ripping off of theme park Europeans.