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
Darker Prime sequel built on mirrored light and dark world traversal.

Optimization · Pure Optimization
An invincible Wario solves transformation puzzles to reclaim treasures inside a cursed music box.
Metroid Prime 2: Echoes leans Optimization (Practiced Mastery); Wario Land 3 leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Metroid Prime 2: Echoes
lock-on combat, harsher but still forgiving aim
Wario Land 3
Invincible Wario shifts weight off reflexes
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Metroid Prime 2: Echoes
Ing follow scripted patterns
Wario Land 3
No adaptive opponents
Metroid Prime 2: Echoes leans a little harder on variance, though the gap is small.
Metroid Prime 2: Echoes
dark-world hazards surprise until learned
Wario Land 3
Treasure effects unknown on first discovery
Wario Land 3 leans a little harder on optimization, though the gap is small.
Metroid Prime 2: Echoes
dual-world routing and key hunts reward planning
Wario Land 3
Transformation puzzles and treasure unlock order are the game
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.