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

Optimization · Pure Optimization
Sequel that adds a mother-daughter pair to its impossible-architecture puzzles.

Optimization · Pure Optimization
Gentle puzzle adventure about an ember rekindling lost souls.
Monument Valley 2 leans Optimization (Pure Optimization); The Last Campfire 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.
Monument Valley 2
Gentle touch controls, no reflexes
The Last Campfire
Gentle controls, no fail pressure
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Monument Valley 2
Nothing opposes you
The Last Campfire
No adversaries
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Monument Valley 2
Deterministic authored levels
The Last Campfire
Linear and authored
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Monument Valley 2
Geometry manipulation puzzles with intended solutions
The Last Campfire
Self-contained logic puzzles with fixed 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.