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 · Pure Optimization
A 90s-set mystery adventure following a motorcycle-riding journalist into her hometown's secrets.

Optimization · Pure Optimization
A dark adventure game about a suicidal woman granted immortality to hunt five psychopaths.
Kathy Rain leans Optimization (Pure Optimization); The Cat Lady leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Kathy Rain
No physical demands
The Cat Lady
Side-scrolling adventure controls require no dexterity
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kathy Rain
No adaptive opponent
The Cat Lady
The Parasites are story antagonists, not adaptive opponents
Kathy Rain leans a little harder on variance, though the gap is small.
Kathy Rain
Mystery beats are hidden only until discovered
The Cat Lady
Mild unknowns in puzzle solutions on a blind playthrough
Kathy Rain leans a little harder on optimization, though the gap is small.
Kathy Rain
Fixed puzzle and dialogue chain; one solution path
The Cat Lady
Adventure-game puzzles have fixed discoverable solutions
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.