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

Optimization · Practiced Mastery
Kiryu's farewell chapter protecting a baby in seaside Onomichi.

Optimization · Practiced Mastery
Remake pitting Kiryu against the Dragon of Kansai across two cities.
Yakuza 6: The Song of Life leans Optimization (Practiced Mastery); Yakuza Kiwami 2 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.
Yakuza 6: The Song of Life
Simplified Dragon Engine combat keeps a light timing test.
Yakuza Kiwami 2
Dragon Engine brawling rewards timing without demanding mastery.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Yakuza 6: The Song of Life
Enemies follow fixed scripts.
Yakuza Kiwami 2
Enemies follow fixed aggression scripts.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Yakuza 6: The Song of Life
Negligible randomness.
Yakuza Kiwami 2
Slight randomness in street encounters.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Yakuza 6: The Song of Life
Stat feeding and heat upgrades are straightforward systems.
Yakuza Kiwami 2
Ability tree, gear and minigame economies reward study.
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.