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 choice-driven narrative adventure testing little beyond attention to consequences.

Optimization · Light / Casual
A gorgeous first-person mystery about piecing together a boy's disappearance.
Dreamfall Chapters leans Optimization (Light / Casual); The Vanishing of Ethan Carter 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.
Dreamfall Chapters
Walking and dialogue selection demand nothing physical
The Vanishing of Ethan Carter
Walking and looking, nothing more
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dreamfall Chapters
No adaptive opposition in a scripted narrative
The Vanishing of Ethan Carter
No opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dreamfall Chapters
Choice consequences are hidden until they land
The Vanishing of Ethan Carter
The mystery is hidden only until discovered
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dreamfall Chapters
Light puzzles and choice mapping, mostly story consumption
The Vanishing of Ethan Carter
Reconstructing event sequences is light deduction
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.