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
A dungeon-management strategy game where you build lairs and crush invading heroes.

Optimization · Pure Optimization
JRPG where you program party AI through its gambit system.
Dungeons 3 leans Optimization (Pure Optimization); Final Fantasy XII 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.
Dungeons 3
minimal direct control, mostly management
Final Fantasy XII
Gambits automate combat away from the hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dungeons 3
scripted hero AI, not adaptive
Final Fantasy XII
Enemy AI is fixed and exploitable
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dungeons 3
some random dungeon events
Final Fantasy XII
Rare spawns and drop RNG
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dungeons 3
base-building economy and unit optimization
Final Fantasy XII
Programming gambit logic IS the gameplay
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.