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
Open-world Stone Age action game about hunting and conquering tribal outposts with tamed beasts.

Execution · Practiced Mastery
Arcade driving gated by a randomised upgrade-card progression economy.
Far Cry Primal leans Execution (Practiced Mastery); Need for Speed: Payback 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 Primal
Bow aim, melee timing, beast control under pressure
Need for Speed: Payback
Arcade handling and chase setpieces need decent hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Far Cry Primal
Scripted tribal AI never models the player
Need for Speed: Payback
Cops and rivals run scripted pursuit logic
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Far Cry Primal
Wildlife encounters and patrol spawns are random
Need for Speed: Payback
Speed-card upgrade rolls gate progression randomly
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Far Cry Primal
Outpost routes, crafting economy, beast taming order
Need for Speed: Payback
Grinding efficient builds and routes is the systems layer
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.