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 kinetic visual novel that tests nothing beyond willingness to read.

Variance · Light / Casual
A short horror visual novel seen through a man whose senses render the world as flesh.
Nekopara Vol. 3 leans Variance (Light / Casual); The Song of Saya 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.
Nekopara Vol. 3
Clicking through text has no physical demand
The Song of Saya
No dexterity component; pure reading
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Nekopara Vol. 3
No opponent of any kind
The Song of Saya
No opponent of any kind
The Song of Saya leans a little harder on variance, though the gap is small.
Nekopara Vol. 3
The story is fixed; nothing hidden but unread pages
The Song of Saya
A few branch choices hide unseen endings
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Nekopara Vol. 3
Nearly kinetic novel - no meaningful choices to solve
The Song of Saya
Minimal choice mapping across three endings
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.