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.

Variance · Light / Casual
A short horror visual novel seen through a man whose senses render the world as flesh.

Variance · Light / Casual
An exploration of narrative branches that deliberately tests nothing.
The Song of Saya 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.
The Song of Saya
No dexterity component; pure reading
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.
The Song of Saya
No opponent of any kind
The Stanley Parable
The narrator is a script, however much he pretends otherwise
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
The Song of Saya
A few branch choices hide unseen endings
The Stanley Parable
Endings are hidden information until you wander into them
The Stanley Parable leans a little harder on optimization, though the gap is small.
The Song of Saya
Minimal choice mapping across three endings
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.