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 · Pure Optimization
A gothic horror RPG blending survival-horror atmosphere with tactical grid battles in a haunted Welsh monastery.

Optimization · Pure Optimization
A charming JRPG carried by familiar evolution and party-build routing.
Koudelka leans Optimization (Pure Optimization); Ni no Kuni: Wrath of the White Witch 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.
Koudelka
Turn-based grid combat, no dexterity
Ni no Kuni: Wrath of the White Witch
Hybrid action-turn combat, low input demand
Ni no Kuni: Wrath of the White Witch leans a little harder on reads, though the gap is small.
Koudelka
Monsters act on simple fixed logic
Ni no Kuni: Wrath of the White Witch
Scripted enemies
Koudelka leans a little harder on variance, though the gap is small.
Koudelka
Random encounters and drop rolls
Ni no Kuni: Wrath of the White Witch
Familiar catch and drop rolls
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Koudelka
Stat allocation and durability planning decide fights
Ni no Kuni: Wrath of the White Witch
Familiar evolution and party routing rewarded
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.