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.

Optimization · Practiced Mastery
An open-world stealth-action game where a turncoat assassin hunts his old brotherhood across the North Atlantic.

Execution · Practiced Mastery
Big Daddy POV return to Rapture with tighter combat systems.
Assassin's Creed Rogue leans Optimization (Practiced Mastery); BioShock 2 leans Execution (Practiced Mastery).
BioShock 2 leans a little harder on execution, though the gap is small.
Assassin's Creed Rogue
Forgiving parkour and counter-heavy combat ask little
BioShock 2
Dual-wield drill and gun timing matter.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed Rogue
Stalker assassins ambush by script, not adaptation
BioShock 2
Splicer AI scripted, not adaptive.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed Rogue
Some naval weather and patrol noise
BioShock 2
Sister-gathering waves add randomness.
Assassin's Creed Rogue leans a little harder on optimization, though the gap is small.
Assassin's Creed Rogue
Ship upgrades, fleet economy, and collectible routing dominate
BioShock 2
Plasmid combos and gear loadouts 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.