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

Optimization · Pure Optimization
An RPG where programming automated gambit systems and optimizing builds is the true skill test.

Optimization · Pure Optimization
Tests party building and turn-by-turn resource play across explorable fixed dungeons.
Final Fantasy XII: The Zodiac Age leans Optimization (Pure Optimization); Might & Magic X: Legacy leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Final Fantasy XII: The Zodiac Age
no real-time physical skill, gambit-automated
Might & Magic X: Legacy
Turn-based grid steps - no dexterity needed
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Final Fantasy XII: The Zodiac Age
no adaptive opponents, scripted encounters
Might & Magic X: Legacy
Monsters use fixed behaviours, never adapt
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Final Fantasy XII: The Zodiac Age
loot and encounter randomness present
Might & Magic X: Legacy
Dungeon contents are scripted-but-unknown until explored
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Final Fantasy XII: The Zodiac Age
gambit and job builds are near-solvable
Might & Magic X: Legacy
Party builds, skill grandmastery and turn economy are the whole game
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.