head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Optimization · Practiced Mastery
A real-time RPG carried by ascension-grid routing and magic crafting.

Optimization · Practiced Mastery
Breezy open-world adventure romping through Greek myth puzzles and monsters.
Final Fantasy XV leans Optimization (Practiced Mastery); Immortals Fenyx Rising 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.
Final Fantasy XV
Real-time combat, modest input demand
Immortals Fenyx Rising
Dodge timing and aerial combos
Final Fantasy XV leans a little harder on reads, though the gap is small.
Final Fantasy XV
Scripted enemies
Immortals Fenyx Rising
Mythic beasts follow fixed movesets
Final Fantasy XV leans a little harder on variance, though the gap is small.
Final Fantasy XV
Loot and ascension variance
Immortals Fenyx Rising
Little randomness in the open world
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Final Fantasy XV
Ascension grid, magic crafting, party planning
Immortals Fenyx Rising
Vault puzzles, gear builds, and stamina routing
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.