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
Helicopter handling under fire while routing fuel and ammo across fixed missions.

Execution · Practiced Mastery
A Himalayan open-world shooter refining the outpost-clearing formula.
Desert Strike: Return to the Gulf leans Execution (Practiced Mastery); Far Cry 4 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.
Desert Strike: Return to the Gulf
Helicopter inertia and dodging fire demand real stick control
Far Cry 4
Gunplay plus gyrocopter and elephant chaos
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Desert Strike: Return to the Gulf
Defenses are fixed emplacements, nothing adapts
Far Cry 4
Scripted outpost AI
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Desert Strike: Return to the Gulf
Maps are unknown on first sortie only
Far Cry 4
Wildlife and patrol variation
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Desert Strike: Return to the Gulf
Fuel, ammo and mission-order routing is the strategic core
Far Cry 4
Outpost approaches and skill trees are plannable
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.