head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Variance · Light / Casual
A choice-driven comedy adventure with almost no skill test at all.

Variance · Light / Casual
An exploration of narrative branches that deliberately tests nothing.
Tales from the Borderlands leans Variance (Light / Casual); The Stanley Parable leans Variance (Light / Casual).
Tales from the Borderlands leans a little harder on execution, though the gap is small.
Tales from the Borderlands
Occasional QTEs are the only physical demand
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.
Tales from the Borderlands
No opponent of any kind
The Stanley Parable
The narrator is a script, however much he pretends otherwise
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Tales from the Borderlands
Story branches are unknown until chosen
The Stanley Parable
Endings are hidden information until you wander into them
The Stanley Parable leans a little harder on optimization, though the gap is small.
Tales from the Borderlands
Choices barely change outcomes; nothing to solve
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.