head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

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

Optimization · Practiced Mastery
A relaxed family collect-a-thon testing completionist routing over any reflex.
Costume Quest leans Optimization (Practiced Mastery); LEGO Harry Potter: Years 5-7 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.
Costume Quest
Timed button prompts are the only dexterity ask
LEGO Harry Potter: Years 5-7
Forgiving spell-casting and platforming for kids
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
LEGO Harry Potter: Years 5-7
Enemies are scripted props posing no adaptive threat
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Costume Quest
Quest content is fixed once doors are knocked
LEGO Harry Potter: Years 5-7
Collectibles are fixed, just initially unknown
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
LEGO Harry Potter: Years 5-7
Spell-gated collectible routing is the real activity
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.