I find it interesting that the dev's made a lot of missions that are different depending on which leader you follow, Amita or Sabal. So I wanted to state that one of my favorite missions is the first one with Amita where you have to get the intel from the camp (you get this mission at Kalina Bazar - the first post you takeover).
The mission for Sabal is much easier I find as you go to the lower camp and have numerous allies to help defend the lower camp. Then you go to the upper camp and take on a few hunters.
With Amitas mission you go to the upper camp first to take on the hunters and search the dead golden path members for the intel. That part is not to difficult, but...then you go to the lower camp and take on about 12 hunters and chargers and the wolves, etc. that the hunters are controlling and I find this part quite difficult, especially very early in the game without the weapons and skills you aquire later and its interesting to me that you have no assistance from golden path, but you do in Sabals mission.
The next mission that I find Amitas mission is better (at least as I remeber it, it is Amitas mission) is after Jelundar Temple is done you are instructed to go back to Utkaresh village and defend it from artillary. This attack is pretty difficult as there are large numbers of enemies and they are relentless. Of course by this time one can aquire the MG42 and its a little OP but I like doing it with the Shredder which makes it a little more challenging.
The Sabal mission is to go disarm the artillary and to me is not nearly as difficult and if done stealty (sniper) is fairly easy.
A lot of the missions are diverse as the himalaya Willis missions are noticeably different from the poppy field missions in location and game play. I like the shangri-la missions also, but.... black bird is a pain in the ***. So i want to give the devs some credit for creating such a nice varied plate of challenges to overcome.