head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Light / Casual
An interactive wordless short story with essentially no skill test.

Variance · Light / Casual
A melancholic island stroll where the only mechanic is listening to the story unfold.
A Bird Story leans Execution (Light / Casual); Dear Esther leans Variance (Light / Casual).
A Bird Story leans a little harder on execution, though the gap is small.
A Bird Story
Walking through scenes is the only input
Dear Esther
Walking is the only verb; no skill ceiling.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
A Bird Story
No opponent of any kind
Dear Esther
No opponent of any kind.
Dear Esther leans a little harder on variance, though the gap is small.
A Bird Story
Wholly linear with nothing hidden mechanically
Dear Esther
Narration fragments are semi-randomised between playthroughs.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
A Bird Story
Nothing to solve; it is a told story
Dear Esther
Nothing to solve; the island is the story.
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.