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.

Execution · Practiced Mastery
Drilling fixed enemy movesets until parry-perfect execution carries a run.

Execution · Practiced Mastery
A character action RPG built on tight parry timing against elaborate scripted bosses.
Sifu leans Execution (Practiced Mastery); Stellar Blade leans Execution (Practiced Mastery).
Sifu leans a little harder on execution, though the gap is small.
Sifu
Parry and dodge timing on tight windows is everything
Stellar Blade
Parry and perfect-dodge timing windows define the ceiling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Sifu
Enemies attack from fixed movesets, never adapt
Stellar Blade
Bosses run fixed movesets, learnable not adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Sifu
Levels are deterministic once learned
Stellar Blade
Encounters and loot are static and predictable
Sifu leans a little harder on optimization, though the gap is small.
Sifu
Learning movesets, shortcuts and the aging economy is the meta
Stellar Blade
Exospine builds, gear and moveset study reward preparation
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.