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

Execution · Practiced Mastery
Open-world western about an outlaw forced to hunt down his old gang.

Optimization · Practiced Mastery
Kiryu's farewell chapter protecting a baby in seaside Onomichi.
Red Dead Redemption leans Execution (Practiced Mastery); Yakuza 6: The Song of Life leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Red Dead Redemption
Dead Eye softens but gunplay still wants aim
Yakuza 6: The Song of Life
Simplified Dragon Engine combat keeps a light timing test.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Red Dead Redemption
Multiplayer skirmishes add light human prediction
Yakuza 6: The Song of Life
Enemies follow fixed scripts.
Red Dead Redemption leans a little harder on variance, though the gap is small.
Red Dead Redemption
Ambient events and spawns vary mildly
Yakuza 6: The Song of Life
Negligible randomness.
Yakuza 6: The Song of Life leans a little harder on optimization, though the gap is small.
Red Dead Redemption
Mission approaches and economy are learnable
Yakuza 6: The Song of Life
Stat feeding and heat upgrades are straightforward systems.
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.