I think I have killed more elk (many in sheep country) wearing wranglers than everything else combined...though when the snow is more than ankle deep or so I do break out the Filson wool, and sometimes some relatively inexpensive UnderArmor pants I picked up somewhere on sale. I have had various Kuiu and some Sitka gear, as well as other synthetics, and they worked well until a hole got poked or wore into them (which wasn't hard to do), then they were useless.
I honestly see no need for the expensive synthetics, though they do seem to have a loyal following.
Wranglers and wool for me. For an expensive sheep hunt wayyyy back in the bush, I would look into some merino wool or the upper echelon Kuiu pants.
Has the OP gone on the hunt yet?
