head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, 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 gentle social journey testing little beyond exploration and cooperation.
Firewatch leans Optimization (Light / Casual); Sky: Children of the Light leans Optimization (Light / Casual).
Sky: Children of the Light leans a little harder on execution, though the gap is small.
Firewatch
Walking and radio dialogue only.
Sky: Children of the Light
Gentle flight controls with no failure pressure
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.
Sky: Children of the Light
Other players are companions, not adversaries
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.
Sky: Children of the Light
Daily events rotate on known schedules
Sky: Children of the Light leans a little harder on optimization, though the gap is small.
Firewatch
Few systems to optimize.
Sky: Children of the Light
Candle routes and collectible runs are lightly optimisable
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.