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
First-person puzzle adventure unraveling a Lovecraft-tinged island mystery.

Optimization · Pure Optimization
Ancient China city builder about elegant housing-block logistics.
Call of the Sea leans Optimization (Pure Optimization); Emperor: Rise of the Middle Kingdom 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.
Call of the Sea
Walking and clicking, no dexterity test
Emperor: Rise of the Middle Kingdom
Pausable city placement, no pressure
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Call of the Sea
No opponent of any kind
Emperor: Rise of the Middle Kingdom
No adaptive opposition
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of the Sea
Hidden solutions surprise only once
Emperor: Rise of the Middle Kingdom
Invasions and events on known schedules
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of the Sea
Deducing fixed puzzle logic is the whole game
Emperor: Rise of the Middle Kingdom
Walker logistics and feng shui block planning
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.