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 turn-based strategy game where building the optimal army and economy decides victory.

Optimization · Pure Optimization
Turn-based team-building optimization with collection RNG and optional human battles.
Might & Magic: Heroes VI leans Optimization (Pure Optimization); Pokémon Ultra Moon 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.
Might & Magic: Heroes VI
no real-time physical skill needed
Pokémon Ultra Moon
Turn-based menus require no dexterity
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Might & Magic: Heroes VI
predicting human opponent strategy in PvP
Pokémon Ultra Moon
Only human link battles involve predicting switches
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Might & Magic: Heroes VI
combat rolls and map resources random
Pokémon Ultra Moon
Wild encounters, IVs and catch rolls add randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Might & Magic: Heroes VI
army building and economy near-solvable
Pokémon Ultra Moon
Type matchups and team building are the solvable core
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.