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 brief branching story experienced rather than tested.

Variance · Light / Casual
A short horror visual novel seen through a man whose senses render the world as flesh.
Missed Messages. 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.
Missed Messages.
Clicking through scenes takes no skill
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.
Missed Messages.
Branches are authored, nothing adapts
The Song of Saya
No opponent of any kind
Missed Messages. leans a little harder on variance, though the gap is small.
Missed Messages.
Endings are hidden until each path is tried
The Song of Saya
A few branch choices hide unseen endings
Missed Messages. leans a little harder on optimization, though the gap is small.
Missed Messages.
Finding all endings is a short checklist
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.