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

Execution · Practiced Mastery
A psychological action-horror story about a writer fighting darkness with a flashlight.

Optimization · Practiced Mastery
Ezio's Renaissance revenge tale of parkour, assassination, and villa-building across Italy.
Alan Wake leans Execution (Practiced Mastery); Assassin's Creed II leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Alan Wake
Flashlight-then-shoot timing and dodges
Assassin's Creed II
Counter-heavy combat stays forgiving
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Alan Wake
Taken spawn on triggers, never adapt
Assassin's Creed II
Guards follow scripts
Alan Wake leans a little harder on variance, though the gap is small.
Alan Wake
Ambush placements surprise once
Assassin's Creed II
Fixed world and missions
Assassin's Creed II leans a little harder on optimization, though the gap is small.
Alan Wake
Resource management and set encounters learnable
Assassin's Creed II
Villa economy and route planning, lightly
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.