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 short horror visual novel seen through a man whose senses render the world as flesh.

Variance · Light / Casual
A visual novel tour of New York's vampire politics in the World of Darkness.
The Song of Saya leans Variance (Light / Casual); Vampire: The Masquerade - Coteries of New York 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
Vampire: The Masquerade - Coteries of New York
Reading and choosing, nothing physical
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
Vampire: The Masquerade - Coteries of New York
No opponent
The Song of Saya leans a little harder on variance, though the gap is small.
The Song of Saya
A few branch choices hide unseen endings
Vampire: The Masquerade - Coteries of New York
Branch outcomes unknown only on first read
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
The Song of Saya
Minimal choice mapping across three endings
Vampire: The Masquerade - Coteries of New York
A few choices to optimize, mostly linear story
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.