head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Light / Casual
A hidden-object hunt rewarding patient visual scanning of dense scenes.

Optimization · Light / Casual
A gorgeous first-person mystery about piecing together a boy's disappearance.
A Castle Full of Cats leans Optimization (Light / Casual); The Vanishing of Ethan Carter 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.
A Castle Full of Cats
Pointing and clicking at cats, nothing more
The Vanishing of Ethan Carter
Walking and looking, nothing more
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
A Castle Full of Cats
No opponent anywhere in the castle
The Vanishing of Ethan Carter
No opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
A Castle Full of Cats
Hidden cats are unknown positions until spotted
The Vanishing of Ethan Carter
The mystery is hidden only until discovered
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
A Castle Full of Cats
Methodical scene-sweeping solves it completely
The Vanishing of Ethan Carter
Reconstructing event sequences is light deduction
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.