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

Optimization · Practiced Mastery
Tests routing an ever-growing ball through fixed stages against the clock.

Execution · Practiced Mastery
An action RPG where narrative depth is paired with moderately solvable combat systems.
Me & My Katamari leans Optimization (Practiced Mastery); NieR leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Me & My Katamari
Awkward PSP rolling controls demand constant steering effort
NieR
combat timing and dodges matter
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Me & My Katamari
Objects and people never adapt to the ball
NieR
scripted enemies, no adaptation
NieR leans a little harder on variance, though the gap is small.
Me & My Katamari
Object layouts are fixed per stage
NieR
loot and encounter randomness
Me & My Katamari leans a little harder on optimization, though the gap is small.
Me & My Katamari
Size-growth routing per stage has learnable optimal paths
NieR
builds and side systems solvable
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.