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.

Optimization · Light / Casual
A relaxed visual search for a hundred hidden cats across hand-drawn scenes.

Optimization · Light / Casual
A first-person mystery about a fire lookout in a Wyoming forest.
100 Asian Cats leans Optimization (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.
100 Asian Cats
Clicking spotted cats demands no dexterity
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.
100 Asian Cats
Solo hidden-object game with no opponent
Firewatch
No adaptive opposition.
100 Asian Cats leans a little harder on variance, though the gap is small.
100 Asian Cats
Cat hiding spots are unknown until found, fixed thereafter
Firewatch
Minor environmental discoveries.
100 Asian Cats leans a little harder on optimization, though the gap is small.
100 Asian Cats
Systematic screen-scanning is the only solvable layer
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.