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 first-person mystery about a fire lookout in a Wyoming forest.

Optimization · Light / Casual
A surreal British comedy game where a tiny salesman slaps his way through a Yorkshire town's errands.
Firewatch leans Optimization (Light / Casual); Thank Goodness You're Here! 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.
Firewatch
Walking and radio dialogue only.
Thank Goodness You're Here!
Walking and slapping, nothing demanding
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.
Thank Goodness You're Here!
No opponent, only townsfolk bits
Firewatch leans a little harder on variance, though the gap is small.
Firewatch
Minor environmental discoveries.
Thank Goodness You're Here!
Jokes land in fixed order
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.
Thank Goodness You're Here!
Light errand sequencing at most
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.