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 · Practiced Mastery
Big Daddy POV return to Rapture with tighter combat systems.

Execution · Practiced Mastery
Open-world Stone Age action game about hunting and conquering tribal outposts with tamed beasts.
BioShock 2 leans Execution (Practiced Mastery); Far Cry Primal leans Execution (Practiced Mastery).
Far Cry Primal leans a little harder on execution, though the gap is small.
BioShock 2
Dual-wield drill and gun timing matter.
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.
BioShock 2
Splicer AI scripted, not adaptive.
Far Cry Primal
Scripted tribal AI never models the player
Far Cry Primal leans a little harder on variance, though the gap is small.
BioShock 2
Sister-gathering waves 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.
BioShock 2
Plasmid combos and gear loadouts solvable.
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.