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
A walking simulator piecing together a vanished English village's final days.

Variance · Light / Casual
An exploration of narrative branches that deliberately tests nothing.
Everybody's Gone to the Rapture leans Optimization (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.
Everybody's Gone to the Rapture
Walking is the only verb
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.
Everybody's Gone to the Rapture
No opponent
The Stanley Parable
The narrator is a script, however much he pretends otherwise
The Stanley Parable leans a little harder on variance, though the gap is small.
Everybody's Gone to the Rapture
Story fragments hidden until found
The Stanley Parable
Endings are hidden information until you wander into them
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Everybody's Gone to the Rapture
Light exploration completion at most
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.