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
Short narrative horror about a doomed freighter crew told in fractured time.

Optimization · Light / Casual
A guided comedy mystery that tests attention to dialogue more than any skill.
Mouthwashing leans Optimization (Light / Casual); The Murder of Sonic the Hedgehog 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.
Mouthwashing
Walking and simple interactions
The Murder of Sonic the Hedgehog
Clicking dialogue and one minigame; no dexterity test
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mouthwashing
No opposition; it is a story
The Murder of Sonic the Hedgehog
A scripted whodunnit; nobody adapts to you
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mouthwashing
Narrative surprises only on first viewing
The Murder of Sonic the Hedgehog
The mystery is hidden information on first play only
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mouthwashing
Light puzzles guide a fixed story
The Murder of Sonic the Hedgehog
Deduction is guided; the story solves itself
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.