head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Optimization · Light / Casual
A first-person mystery about a fire lookout in a Wyoming forest.

Optimization · Light / Casual
A guided comedy mystery that tests attention to dialogue more than any skill.
Firewatch leans Optimization (Light / Casual); The Murder of Sonic the Hedgehog 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.
Firewatch
Walking and radio dialogue only.
The Murder of Sonic the Hedgehog
Clicking dialogue and one minigame; no dexterity test
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Firewatch
No adaptive opposition.
The Murder of Sonic the Hedgehog
A scripted whodunnit; nobody adapts to you
The Murder of Sonic the Hedgehog leans a little harder on variance, though the gap is small.
Firewatch
Minor environmental discoveries.
The Murder of Sonic the Hedgehog
The mystery is hidden information on first play only
The Murder of Sonic the Hedgehog leans a little harder on optimization, though the gap is small.
Firewatch
Few systems to optimize.
The Murder of Sonic the Hedgehog
Deduction is guided; the story solves itself
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.