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

Optimization · Light / Casual
Tests very little mechanically - a dark authored story carried by light RPG battles.
Firewatch leans Optimization (Light / Casual); Wadanohara and the Great Blue Sea 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.
Wadanohara and the Great Blue Sea
Top-down walking and menu battles need no dexterity
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.
Wadanohara and the Great Blue Sea
Story characters never adapt to the player
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Firewatch
Minor environmental discoveries.
Wadanohara and the Great Blue Sea
Plot twists are authored, not random
Wadanohara and the Great Blue Sea leans a little harder on optimization, though the gap is small.
Firewatch
Few systems to optimize.
Wadanohara and the Great Blue Sea
Simple RPG battles and light puzzles barely resist
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.