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
A feudal-Japan open-world RPG balancing stealth routing against build progression.

Optimization · Practiced Mastery
A real-time RPG carried by ascension-grid routing and magic crafting.
Assassin's Creed Shadows leans Optimization (Practiced Mastery); Final Fantasy XV 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.
Assassin's Creed Shadows
Dual protagonists reward timing, still forgiving.
Final Fantasy XV
Real-time combat, modest input demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed Shadows
Enemy AI scripted, not adaptive.
Final Fantasy XV
Scripted enemies
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed Shadows
Loot and seasonal conditions lightly randomized.
Final Fantasy XV
Loot and ascension variance
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed Shadows
Builds, gear, and stealth routes solvable.
Final Fantasy XV
Ascension grid, magic crafting, party planning
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.