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
The genre-defining metroidvania with deep RPG systems.

Optimization · Practiced Mastery
The systems-heavy sequel where the journey itself is the danger.
Castlevania: Symphony of the Night leans Optimization (Pure Optimization); Dragon's Dogma 2 leans Optimization (Practiced Mastery).
Dragon's Dogma 2 leans a little harder on execution, though the gap is small.
Castlevania: Symphony of the Night
Forgiving action combat
Dragon's Dogma 2
Physical combat and monster climbing demand handling
Castlevania: Symphony of the Night leans a little harder on reads, though the gap is small.
Castlevania: Symphony of the Night
Scripted bosses
Dragon's Dogma 2
Scripted monster ecology, no adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Castlevania: Symphony of the Night
Item drops and rare gear
Dragon's Dogma 2
Emergent travel encounters surprise until learned
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Castlevania: Symphony of the Night
Build crafting and sequence breaks
Dragon's Dogma 2
Vocation builds and pawn logistics reward mastery
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.