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.

Execution · Practiced Mastery
Zelda-meets-God-of-War action adventure starring the horseman War.

Execution · Practiced Mastery
The saga's flashy conclusion sending Sora through Pixar and Disney worlds toward the Keyblade War.
Darksiders leans Execution (Practiced Mastery); Kingdom Hearts III leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Darksiders
combo-driven combat with dodge timing
Kingdom Hearts III
Limit Cut bosses require sharp reactions
Kingdom Hearts III leans a little harder on reads, though the gap is small.
Darksiders
enemies are scripted
Kingdom Hearts III
All opposition is scripted spectacle
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 III
Minimal hidden 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 III
Attraction commands or boss study both solvable
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.