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

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

Execution · Practiced Mastery
A first-person shooter campaign set in the future war of the Terminator films.
BioShock 2 leans Execution (Practiced Mastery); Terminator: Resistance 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.
BioShock 2
Dual-wield drill and gun timing matter.
Terminator: Resistance
Standard FPS gunplay against machines
BioShock 2 leans a little harder on reads, though the gap is small.
BioShock 2
Splicer AI scripted, not adaptive.
Terminator: Resistance
Terminators run fixed AI routines
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
BioShock 2
Sister-gathering waves add randomness.
Terminator: Resistance
Some unexplored map and loot uncertainty
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.
Terminator: Resistance
Stealth routes, crafting, and skill builds 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.