head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
Timing-based swordplay over a solvable stance-and-loadout system in an authored world.

Execution · Practiced Mastery
The saga's flashy conclusion sending Sora through Pixar and Disney worlds toward the Keyblade War.
Ghost of Tsushima: Director's Cut 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.
Ghost of Tsushima: Director's Cut
Parry and stance timing carry duels on harder difficulties
Kingdom Hearts III
Limit Cut bosses require sharp reactions
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Ghost of Tsushima: Director's Cut
Enemies telegraph from fixed scripts, never model you
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.
Ghost of Tsushima: Director's Cut
Open world is authored; little meaningful randomness
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.
Ghost of Tsushima: Director's Cut
Stance matchups, charms and gear form a solvable system
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.