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

Execution · Practiced Mastery
A playable pop album blending rhythm, racing, and shooting into a forgiving stylish ride.

Execution · Practiced Mastery
A whimsical physics game about rolling a sticky ball to absorb the world.
Sayonara Wild Hearts leans Execution (Practiced Mastery); We Love Katamari Reroll + Royal Reverie 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.
Sayonara Wild Hearts
Moderate dodging and timing, deliberately forgiving
We Love Katamari Reroll + Royal Reverie
careful rolling and steering to grow the katamari
We Love Katamari Reroll + Royal Reverie leans a little harder on reads, though the gap is small.
Sayonara Wild Hearts
Scripted pop-album set pieces
We Love Katamari Reroll + Royal Reverie
no opposition, purely solo physics play
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Sayonara Wild Hearts
Fixed levels with memorizable layouts
We Love Katamari Reroll + Royal Reverie
object placement varies minimally
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Sayonara Wild Hearts
Gold-rank score chasing rewards route learning
We Love Katamari Reroll + Royal Reverie
efficient rolling routes are learnable
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.