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

Variance · Light / Casual
A narrative choice game that tests almost nothing mechanically by design.

Optimization · Light / Casual
A first-person mystery about a fire lookout in a Wyoming forest.
Batman: The Enemy Within leans Variance (Light / Casual); Firewatch 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.
Batman: The Enemy Within
Quick-time prompts are deliberately forgiving
Firewatch
Walking and radio dialogue only.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Batman: The Enemy Within
Characters react to choices via fixed branching scripts
Firewatch
No adaptive opposition.
Batman: The Enemy Within leans a little harder on variance, though the gap is small.
Batman: The Enemy Within
Story branches are hidden until a choice reveals them
Firewatch
Minor environmental discoveries.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Batman: The Enemy Within
Little to solve; choices steer narrative, not systems
Firewatch
Few systems to optimize.
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.