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 classic point-and-click adventure where solving inventory puzzles is the entire challenge.

Optimization · Light / Casual
A space physics sandbox where you smash planets together to see what happens.
Grim Fandango Remastered leans Optimization (Light / Casual); Universe Sandbox 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.
Grim Fandango Remastered
no physical skill ceiling, point-and-click
Universe Sandbox
Click-and-drag celestial bodies; no dexterity test
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grim Fandango Remastered
no opponents, puzzle-driven
Universe Sandbox
No opponent of any kind
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grim Fandango Remastered
no meaningful randomness
Universe Sandbox
Deterministic physics simulation, fully visible
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Grim Fandango Remastered
item and dialogue puzzle logic solvable
Universe Sandbox
Light orbital-mechanics tinkering, no win condition to solve
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.