head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, 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 fairy-tale point-and-click adventure following a princess and queen's quest.
Firewatch leans Optimization (Light / Casual); King's Quest VII: The Princeless Bride 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.
King's Quest VII: The Princeless Bride
minimal physical skill, point-and-click
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.
King's Quest VII: The Princeless Bride
no adversarial adaptive opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Firewatch
Minor environmental discoveries.
King's Quest VII: The Princeless Bride
negligible randomness
King's Quest VII: The Princeless Bride leans a little harder on optimization, though the gap is small.
Firewatch
Few systems to optimize.
King's Quest VII: The Princeless Bride
puzzle-solving logic across fairy-tale lands
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.