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

Optimization · Practiced Mastery
Breezy open-world adventure romping through Greek myth puzzles and monsters.

Optimization · Practiced Mastery
A surreal action game about rolling an ever-growing ball of everyday objects.
Immortals Fenyx Rising leans Optimization (Practiced Mastery); Katamari Damacy 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.
Immortals Fenyx Rising
Dodge timing and aerial combos
Katamari Damacy
Dual-stick rolling control, forgiving but real
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Immortals Fenyx Rising
Mythic beasts follow fixed movesets
Katamari Damacy
No opposition, just clutter
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Immortals Fenyx Rising
Little randomness in the open world
Katamari Damacy
Object layouts are fixed
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Immortals Fenyx Rising
Vault puzzles, gear builds, and stamina routing
Katamari Damacy
Size-growth routing through each level
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.