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
Atmospheric first-person puzzle solving driven by exploration and symbol logic.

Optimization · Pure Optimization
An open-ended needs-and-money system that rewards efficient scheduling.
Gray Dawn leans Optimization (Pure Optimization); The Sims 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.
Gray Dawn
Walking and examining objects needs no dexterity
The Sims
Clicking menus has no physical ceiling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Gray Dawn
Scripted visions never adapt to the player
The Sims
Sims run need-driven scripts, not minds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Gray Dawn
Clue locations are unknown only until explored
The Sims
Event rolls add flavour, all quickly mapped
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Gray Dawn
Piecing religious symbol puzzles together is the test
The Sims
Need scheduling, career grinding and money loops are solvable
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.