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
Zelda-meets-God-of-War action adventure starring the horseman War.

Execution · Practiced Mastery
The series' action peak, with flashy drive forms and superbosses that built a lasting challenge-run community.
Darksiders leans Execution (Practiced Mastery); Kingdom Hearts II leans Execution (Practiced Mastery).
Kingdom Hearts II leans a little harder on execution, though the gap is small.
Darksiders
combo-driven combat with dodge timing
Kingdom Hearts II
Revenge values and Data fights demand precise play
Kingdom Hearts II leans a little harder on reads, though the gap is small.
Darksiders
enemies are scripted
Kingdom Hearts II
Even superbosses run scripted, mappable patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Darksiders
world and bosses are fixed
Kingdom Hearts II
Fully visible action systems
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Darksiders
Zelda-style dungeons and upgrade routing
Kingdom Hearts II
Forms, abilities, and boss study reward labbing
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.