head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
Tense, linear Metroid hunted through a station by a clone of yourself.

Execution · Practiced Mastery
Planning and flawlessly executing long infiltration routes with no safety net.
Metroid Fusion leans Execution (Practiced Mastery); Project I.G.I.: I'm Going In leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Metroid Fusion
demanding bosses for a 2D Metroid
Project I.G.I.: I'm Going In
No mid-mission saves makes every shot and sprint count
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
Project I.G.I.: I'm Going In
Guards follow alarm scripts, punishing but not adaptive
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
Project I.G.I.: I'm Going In
Patrols vary slightly, mostly memorisable layouts
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
Project I.G.I.: I'm Going In
Planning infiltration routes through bases is the core test
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.