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.

Optimization · Practiced Mastery
Ezio's Renaissance revenge tale of parkour, assassination, and villa-building across Italy.

Optimization · Practiced Mastery
Darker Prime sequel built on mirrored light and dark world traversal.
Assassin's Creed II leans Optimization (Practiced Mastery); Metroid Prime 2: Echoes 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.
Assassin's Creed II
Counter-heavy combat stays forgiving
Metroid Prime 2: Echoes
lock-on combat, harsher but still forgiving aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed II
Guards follow scripts
Metroid Prime 2: Echoes
Ing follow scripted patterns
Metroid Prime 2: Echoes leans a little harder on variance, though the gap is small.
Assassin's Creed II
Fixed world and missions
Metroid Prime 2: Echoes
dark-world hazards surprise until learned
Metroid Prime 2: Echoes leans a little harder on optimization, though the gap is small.
Assassin's Creed II
Villa economy and route planning, lightly
Metroid Prime 2: Echoes
dual-world routing and key hunts reward planning
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.