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.

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

Optimization · Light / Casual
A branching thriller novel that tests attention to its story, not skill.
Firewatch leans Optimization (Light / Casual); The Devil on G-String leans Optimization (Light / Casual).
Firewatch leans a little harder on execution, though the gap is small.
Firewatch
Walking and radio dialogue only.
The Devil on G-String
Reading and clicking choices takes no skill
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.
The Devil on G-String
No opponent - the thriller plot is fixed
The Devil on G-String leans a little harder on variance, though the gap is small.
Firewatch
Minor environmental discoveries.
The Devil on G-String
Branch outcomes are hidden until a route is read
The Devil on G-String leans a little harder on optimization, though the gap is small.
Firewatch
Few systems to optimize.
The Devil on G-String
Finding the right choices for each route is light puzzle work
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.