head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
The template Far Cry: outposts, predators, and a tropical sandbox.

Execution · Practiced Mastery
A narrative third-person shooter that turns a Dubai rescue mission into a study of war's moral cost.
Far Cry 3 leans Execution (Practiced Mastery); Spec Ops: The Line 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.
Far Cry 3
Shooting and stealth fundamentals matter.
Spec Ops: The Line
Competent cover shooting is all the game demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Far Cry 3
Pirate AI uses fixed alert patterns.
Spec Ops: The Line
Enemy squads follow fixed scripted assaults
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Far Cry 3
Wildlife and outpost spawns randomized.
Spec Ops: The Line
Set-piece encounters play out the same each run
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Far Cry 3
Skill trees and weapon mods quickly mastered.
Spec Ops: The Line
Cover routes and loadout choices are quickly solved
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.