head to head
Under Leaves asks more than Firewatch, and the gap is variance.

Optimization · Light / Casual
A first-person mystery about a fire lookout in a Wyoming forest.

Variance · Light / Casual
A painterly hidden-object game testing visual scanning patience.
Firewatch leans Optimization (Light / Casual); Under Leaves leans Variance (Light / Casual).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Firewatch
Walking and radio dialogue only.
Under Leaves
Tapping spotted objects requires nothing physical
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Firewatch
No adaptive opposition.
Under Leaves
No opponent exists
Under Leaves leans clearly harder on variance.
Firewatch
Minor environmental discoveries.
Under Leaves
Object locations are hidden until found - that is the game
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Firewatch
Few systems to optimize.
Under Leaves
Systematic scanning is the only technique
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.