head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, and it is a single point.

Optimization · Practiced Mastery
Learning boss patterns and tuning command-deck builds with moderate action demands.

Execution · Practiced Mastery
Open-world western about an outlaw forced to hunt down his old gang.
Kingdom Hearts 3D: Dream Drop Distance leans Optimization (Practiced Mastery); Red Dead Redemption 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.
Kingdom Hearts 3D: Dream Drop Distance
Flowmotion combat asks moderate timing, rarely punishing
Red Dead Redemption
Dead Eye softens but gunplay still wants aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kingdom Hearts 3D: Dream Drop Distance
Bosses run scripted patterns with no player modelling
Red Dead Redemption
Multiplayer skirmishes add light human prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kingdom Hearts 3D: Dream Drop Distance
Dream Eater drops and spirit rolls add mild randomness
Red Dead Redemption
Ambient events and spawns vary mildly
Kingdom Hearts 3D: Dream Drop Distance leans a little harder on optimization, though the gap is small.
Kingdom Hearts 3D: Dream Drop Distance
Command decks, spirit builds and boss patterns are learnable systems
Red Dead Redemption
Mission approaches and economy are learnable
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.