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.

Optimization · Pure Optimization
A GBA metroidvania built around collecting enemy souls.

Optimization · Pure Optimization
A cult-classic vampire RPG won by discipline choice and skill-check routing.
Castlevania: Aria of Sorrow leans Optimization (Pure Optimization); Vampire: The Masquerade - Bloodlines leans Optimization (Pure Optimization).
Castlevania: Aria of Sorrow leans a little harder on execution, though the gap is small.
Castlevania: Aria of Sorrow
Modest action timing
Vampire: The Masquerade - Bloodlines
Janky hybrid combat, low demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Castlevania: Aria of Sorrow
Scripted enemies
Vampire: The Masquerade - Bloodlines
Scripted NPCs
Castlevania: Aria of Sorrow leans a little harder on variance, though the gap is small.
Castlevania: Aria of Sorrow
Soul drops are heavily random
Vampire: The Masquerade - Bloodlines
Hidden dice under skill checks
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Castlevania: Aria of Sorrow
Soul build crafting dominates
Vampire: The Masquerade - Bloodlines
Discipline, feeding, build routing central
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.