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 wordless atmospheric pilgrimage across dunes toward a distant mountain.

Optimization · Light / Casual
A gentle social journey testing little beyond exploration and cooperation.
Journey 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.
Journey
Gentle gliding with no fail pressure
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.
Journey
Anonymous companions cooperate, never oppose
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.
Journey
World is fixed and linear
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.
Journey
Light scarf-collecting routes at most
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.