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.

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

Optimization · Pure Optimization
An open-world mech JRPG whose combat rewards deep system and build optimization.
Castlevania: Symphony of the Night leans Optimization (Pure Optimization); Xenoblade Chronicles X leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Castlevania: Symphony of the Night
Forgiving action combat
Xenoblade Chronicles X
positioning and arts timing in combat
Castlevania: Symphony of the Night leans a little harder on reads, though the gap is small.
Castlevania: Symphony of the Night
Scripted bosses
Xenoblade Chronicles X
solo JRPG, no adapting opponent
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
Xenoblade Chronicles X
drop rates and crit rolls
Xenoblade Chronicles X leans a little harder on optimization, though the gap is small.
Castlevania: Symphony of the Night
Build crafting and sequence breaks
Xenoblade Chronicles X
deep build/skill/gear system to optimize
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.