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.

Variance · Light / Casual
A psychological thriller visual novel investigating ritual murders in post-earthquake Shibuya.

Variance · Light / Casual
An exploration of narrative branches that deliberately tests nothing.
Chaos;Child leans Variance (Light / Casual); The Stanley Parable leans Variance (Light / Casual).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Chaos;Child
No dexterity component
The Stanley Parable
Walking is the only input
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Chaos;Child
No opponent
The Stanley Parable
The narrator is a script, however much he pretends otherwise
Chaos;Child leans a little harder on variance, though the gap is small.
Chaos;Child
Murder-mystery hidden information and unseen delusion outcomes
The Stanley Parable
Endings are hidden information until you wander into them
Chaos;Child leans a little harder on optimization, though the gap is small.
Chaos;Child
Delusion-trigger combinations gate routes and true ending
The Stanley Parable
Finding all branches is a trivial checklist
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.