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
A helicopter shooter testing aim and maneuvering through scripted combat missions.

Execution · Practiced Mastery
Open-world Stone Age action game about hunting and conquering tribal outposts with tamed beasts.
Army Men: Air Attack 2 leans Execution (Practiced Mastery); Far Cry Primal 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.
Army Men: Air Attack 2
Helicopter aim and maneuvering timing matters
Far Cry Primal
Bow aim, melee timing, beast control under pressure
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Army Men: Air Attack 2
Enemy units follow scripted AI, not adapting
Far Cry Primal
Scripted tribal AI never models the player
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Army Men: Air Attack 2
Mission chaos and pickups add randomness
Far Cry Primal
Wildlife encounters and patrol spawns are random
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Army Men: Air Attack 2
Chopper and copilot loadout choices optimize missions
Far Cry Primal
Outpost routes, crafting economy, beast taming order
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.