head to head
Hollow Knight asks more than Castlevania: Symphony of the Night, and the gap is execution.

Optimization · Pure Optimization
The genre-defining metroidvania with deep RPG systems.

Execution · Practiced Mastery
A precision metroidvania about learning fixed boss patterns and tight platforming.
Castlevania: Symphony of the Night leans Optimization (Pure Optimization); Hollow Knight leans Execution (Practiced Mastery).
Hollow Knight leans clearly harder on execution.
Castlevania: Symphony of the Night
Forgiving action combat
Hollow Knight
Precise platforming and pogo timing dominate hard content.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Castlevania: Symphony of the Night
Scripted bosses
Hollow Knight
Bosses run scripted attack pools; not adaptive.
Castlevania: Symphony of the Night leans a little harder on variance, though the gap is small.
Castlevania: Symphony of the Night
Item drops and rare gear
Hollow Knight
Negligible; world layout is fixed.
Castlevania: Symphony of the Night leans a little harder on optimization, though the gap is small.
Castlevania: Symphony of the Night
Build crafting and sequence breaks
Hollow Knight
Charm builds and boss routes are fully 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.