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
Fantasy 4X with strong asymmetric factions and quest paths.

Optimization · Pure Optimization
Turn-based team-building optimization with collection RNG and optional human battles.
Endless Legend 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.
Endless Legend
turn-based
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.
Endless Legend
scripted AI, limited MP
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.
Endless Legend
quest and tech rolls
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.
Endless Legend
faction-specific yield optimization
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.