head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Light / Casual
Cyberpunk horror where a detective hacks the memories of the dying.

Optimization · Light / Casual
An underwater sci-fi horror about consciousness and identity.
Observer leans Optimization (Light / Casual); SOMA leans Optimization (Light / Casual).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Observer
Walking with brief stealth segments
SOMA
Light stealth, gentle inputs.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Observer
The stalker sequence is scripted
SOMA
Creatures follow scripts.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Observer
Unknown story branches and apartment secrets
SOMA
Some hiding spot variation.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Observer
Investigation logic and clue piecing
SOMA
Few systems to optimize.
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.