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.

Optimization · Light / Casual
Tests nothing competitive - an authored interactive memoir to experience.

Optimization · Light / Casual
A meta-narrative walking sim about defying or obeying a scripted narrator.
If Found... leans Optimization (Light / Casual); The Stanley Parable: Ultra Deluxe leans Optimization (Light / Casual).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
If Found...
Erasing pages takes no skill by design
The Stanley Parable: Ultra Deluxe
Walking and clicking, no mechanical demand.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
If Found...
No opponent in a linear memoir
The Stanley Parable: Ultra Deluxe
Narrator is scripted, not adaptive.
The Stanley Parable: Ultra Deluxe leans a little harder on variance, though the gap is small.
If Found...
Fully authored with nothing random
The Stanley Parable: Ultra Deluxe
Hidden endings to discover.
The Stanley Parable: Ultra Deluxe leans a little harder on optimization, though the gap is small.
If Found...
Nothing to solve - the story simply unfolds
The Stanley Parable: Ultra Deluxe
Mapping ending tree rewards completionists.
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.