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

Execution · Practiced Mastery
High-speed cyborg slasher built on precise parries and slicing anything in half.

Execution · Pure Mechanics
Taopunk metroidvania whose parry-centric boss fights channel Sekiro in 2D.
Metal Gear Rising: Revengeance leans Execution (Practiced Mastery); Nine Sols leans Execution (Pure Mechanics).
Nine Sols leans a little harder on execution, though the gap is small.
Metal Gear Rising: Revengeance
parry timing and blade-mode cuts demand sharp reactions
Nine Sols
Sekiro-style parry timing is the entire combat test
Nine Sols leans a little harder on reads, though the gap is small.
Metal Gear Rising: Revengeance
bosses telegraph fixed patterns
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.
Metal Gear Rising: Revengeance
deterministic encounters
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.
Metal Gear Rising: Revengeance
learning movesets and upgrade priorities
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.