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 gorgeous first-person mystery about piecing together a boy's disappearance.

Variance · Light / Casual
A painterly hidden-object game testing visual scanning patience.
The Vanishing of Ethan Carter leans Optimization (Light / Casual); Under Leaves 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.
The Vanishing of Ethan Carter
Walking and looking, nothing more
Under Leaves
Tapping spotted objects requires nothing physical
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
The Vanishing of Ethan Carter
No opponent
Under Leaves
No opponent exists
Under Leaves leans a little harder on variance, though the gap is small.
The Vanishing of Ethan Carter
The mystery is hidden only until discovered
Under Leaves
Object locations are hidden until found - that is the game
The Vanishing of Ethan Carter leans a little harder on optimization, though the gap is small.
The Vanishing of Ethan Carter
Reconstructing event sequences is light deduction
Under Leaves
Systematic scanning is the only technique
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.