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
Optimizing pair-up chains and offspring builds to steamroll deterministically scripted maps.

Optimization · Pure Optimization
A turn-based tactics game testing positioning and resource planning under hit-chance RNG.
Fire Emblem Fates leans Optimization (Pure Optimization); Rebel Cops 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.
Fire Emblem Fates
Turn-based menu play; no hand-speed demands
Rebel Cops
Aiming is point-based, not twitch reflex
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fire Emblem Fates
AI follows scripted attack priorities, not player modeling
Rebel Cops
Enemy AI is scripted, not adaptive modelling
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fire Emblem Fates
Dual-strike/guard procs and hit rates inject meaningful RNG
Rebel Cops
Hit chances and detection add real randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fire Emblem Fates
Offspring seals, asset/flaw selection, and supports are deeply planned
Rebel Cops
Positioning, resource scarcity and turn planning decide missions
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.