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 · Pure Optimization
A management game about ferrying spirits to the afterlife.

Optimization · Practiced Mastery
A slapstick stealth-puzzle game about being a horrible goose.
Spiritfarer leans Optimization (Pure Optimization); Untitled Goose Game leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Spiritfarer
Platforming is light and forgiving.
Untitled Goose Game
Light stealth timing, forgiving controls.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Spiritfarer
Spirits follow scripted arcs.
Untitled Goose Game
NPCs follow fixed patterns.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Spiritfarer
Minor resource RNG.
Untitled Goose Game
Minor randomness in NPC routines.
Spiritfarer leans a little harder on optimization, though the gap is small.
Spiritfarer
Boat layout and crafting loops reward planning.
Untitled Goose Game
Puzzle list rewards efficient routing.
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.