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 · Practiced Mastery
A charming kid-friendly RPG with timing prompts and light costume strategy.

Optimization · Systems & Chaos
A visual novel first and a light tactics game second, heavy on story.
Costume Quest leans Optimization (Practiced Mastery); Utawarerumono: Mask of Deception leans Optimization (Systems & Chaos).
Costume Quest leans a little harder on execution, though the gap is small.
Costume Quest
Timed button prompts are the only dexterity ask
Utawarerumono: Mask of Deception
Optional timing presses on attacks
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Costume Quest
Monster battles follow simple fixed scripts
Utawarerumono: Mask of Deception
Enemy AI is scripted and predictable
Utawarerumono: Mask of Deception leans a little harder on variance, though the gap is small.
Costume Quest
Quest content is fixed once doors are knocked
Utawarerumono: Mask of Deception
Light combat RNG in a mostly fixed story
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Costume Quest
Costume ability matchups and stamp choices are light strategy
Utawarerumono: Mask of Deception
Easy SRPG battles solved with basic positioning
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.