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
Punishing combat execution against fast scripted enemies with deep encounter solutions.
Metal Gear Rising: Revengeance leans Execution (Practiced Mastery); Ninja Gaiden II Black leans Execution (Pure Mechanics).
Ninja Gaiden II Black leans a little harder on execution, though the gap is small.
Metal Gear Rising: Revengeance
parry timing and blade-mode cuts demand sharp reactions
Ninja Gaiden II Black
Frame-tight blocking, dodging and combo routing define survival
Ninja Gaiden II Black leans a little harder on reads, though the gap is small.
Metal Gear Rising: Revengeance
bosses telegraph fixed patterns
Ninja Gaiden II Black
Aggressive enemies still run scripted, learnable behaviour
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
Ninja Gaiden II Black
Encounters fixed; spawns known after one run
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
Ninja Gaiden II Black
Weapon choice, essence economy and encounter solutions matter
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.