head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Practiced Mastery
Slow-weapon stealth shooting wrapped around hidden-clue investigation.

Execution · Practiced Mastery
The template Far Cry: outposts, predators, and a tropical sandbox.
Betrayer leans Execution (Practiced Mastery); Far Cry 3 leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Betrayer
Slow musket shots make each aimed round count
Far Cry 3
Shooting and stealth fundamentals matter.
Far Cry 3 leans a little harder on reads, though the gap is small.
Betrayer
Ghostly foes patrol on scripts
Far Cry 3
Pirate AI uses fixed alert patterns.
Betrayer leans a little harder on variance, though the gap is small.
Betrayer
Clue locations and ambushes are hidden until found
Far Cry 3
Wildlife and outpost spawns randomized.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Betrayer
Mystery-piecing and loadout choices reward methodical play
Far Cry 3
Skill trees and weapon mods quickly mastered.
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.