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 two-part visual novel that uses a conventional romance setup as a deliberate feint before pivoting to military sci-fi.

Variance · Light / Casual
An exploration of narrative branches that deliberately tests nothing.
Muv-Luv 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.
Muv-Luv
Menu choices only; no physical demands
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.
Muv-Luv
Routes are fully scripted harem-to-military arcs
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.
Muv-Luv
Minimal hidden information in the first entry
The Stanley Parable
Endings are hidden information until you wander into them
Muv-Luv leans a little harder on optimization, though the gap is small.
Muv-Luv
Completing Muv-Luv and Unlimited to unlock Alternative is a light routing puzzle
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.