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
Tense, linear Metroid hunted through a station by a clone of yourself.

Optimization · Practiced Mastery
A lombax and his robot blast through planets in a weapons-driven platformer.
Metroid Fusion leans Execution (Practiced Mastery); Ratchet & Clank leans Optimization (Practiced Mastery).
Metroid Fusion leans a little harder on execution, though the gap is small.
Metroid Fusion
demanding bosses for a 2D Metroid
Ratchet & Clank
Platforming, strafing, and weapon aim against scripted enemies.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Metroid Fusion
SA-X stalking runs on fixed scripts
Ratchet & Clank
No adaptive opponent anywhere.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Metroid Fusion
first-encounter dread fades once mapped
Ratchet & Clank
Unknown level layouts on first pass only.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Metroid Fusion
guided structure still rewards route and pattern knowledge
Ratchet & Clank
Bolt economy, weapon choice, and route knowledge dominate.
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.