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

Optimization · Light / Casual
A point-and-click detective adventure where puzzle logic is the entire test.

Optimization · Light / Casual
A first-person mystery about a fire lookout in a Wyoming forest.
Circle of Blood 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.
Circle of Blood
no physical skill, point-and-click
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.
Circle of Blood
no opponents, puzzle-driven
Firewatch
No adaptive opposition.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Circle of Blood
no meaningful randomness
Firewatch
Minor environmental discoveries.
Circle of Blood leans a little harder on optimization, though the gap is small.
Circle of Blood
inventory puzzle logic is solvable
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.