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.

Optimization · Practiced Mastery
A survival-horror sequel with puzzle-heavy exploration and resource-scarce combat.
BioShock 2 leans Execution (Practiced Mastery); Tormented Souls II leans Optimization (Practiced Mastery).
BioShock 2 leans a little harder on execution, though the gap is small.
BioShock 2
Dual-wield drill and gun timing matter.
Tormented Souls II
Survival-horror aiming and dodging under resource 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.
Tormented Souls II
Fixed monster behavior, not adaptive to player.
Tormented Souls II leans a little harder on variance, though the gap is small.
BioShock 2
Sister-gathering waves add randomness.
Tormented Souls II
Scripted-but-unknown enemy encounters and item placement.
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.
Tormented Souls II
Resource management and puzzle solutions are learnable and solvable.
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.