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

Execution · Pure Mechanics
Stylish character action where frame-perfect dodges slow time for absurd combo punishment.

Execution · Pure Mechanics
Taopunk metroidvania whose parry-centric boss fights channel Sekiro in 2D.
Bayonetta leans Execution (Pure Mechanics); Nine Sols leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Bayonetta
Witch Time dodges and long combo strings
Nine Sols
Sekiro-style parry timing is the entire combat test
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Bayonetta
Angels are scripted, never adaptive
Nine Sols
Bosses follow learnable scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Bayonetta
Fixed encounters with minor enemy mix
Nine Sols
Deterministic authored world
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Bayonetta
Combo routing and scoring for Pure Platinum
Nine Sols
Moveset study, talismans, and route knowledge
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.