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.

Optimization · Pure Optimization
A dark adventure game about a suicidal woman granted immortality to hunt five psychopaths.

Optimization · Pure Optimization
A LucasArts sci-fi adventure where astronauts stranded on an alien world puzzle out its dead civilization.
The Cat Lady leans Optimization (Pure Optimization); The Dig leans Optimization (Pure Optimization).
The Cat Lady leans a little harder on execution, though the gap is small.
The Cat Lady
Side-scrolling adventure controls require no dexterity
The Dig
Point-and-click; no reflex demands.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
The Cat Lady
The Parasites are story antagonists, not adaptive opponents
The Dig
Alien world is static; companions follow scripts.
The Dig leans a little harder on variance, though the gap is small.
The Cat Lady
Mild unknowns in puzzle solutions on a blind playthrough
The Dig
Alien machinery's purpose is hidden until experimented with.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
The Cat Lady
Adventure-game puzzles have fixed discoverable solutions
The Dig
Machine puzzles have single fixed solutions to deduce.
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.