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

Execution · Pure Mechanics
A top-down shoot-em-up testing aim and dodging against scripted alien waves.

Execution · Practiced Mastery
Open-world Stone Age action game about hunting and conquering tribal outposts with tamed beasts.
Earth Defense Force leans Execution (Pure Mechanics); Far Cry Primal leans Execution (Practiced Mastery).
Earth Defense Force leans a little harder on execution, though the gap is small.
Earth Defense Force
Top-down shooting and dodging are the core demand
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.
Earth Defense Force
Enemies are scripted waves, not adaptive
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.
Earth Defense Force
Enemy spawn patterns add some unpredictability
Far Cry Primal
Wildlife encounters and patrol spawns are random
Far Cry Primal leans a little harder on optimization, though the gap is small.
Earth Defense Force
Weapon management and positioning aid survival
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.