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

Execution · Practiced Mastery
Modern stylish-action peak with three playstyles and a combo ceiling players are still climbing.

Execution · Pure Mechanics
Punishing combat execution against fast scripted enemies with deep encounter solutions.
Devil May Cry 5 leans Execution (Practiced Mastery); Ninja Gaiden II Black 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.
Devil May Cry 5
Three movesets and Royal Guard frames set a towering ceiling
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.
Devil May Cry 5
Even Vergil's mirror fight is a learnable script
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.
Devil May Cry 5
V's summons add flavor, not randomness that matters
Ninja Gaiden II Black
Encounters fixed; spawns known after one run
Devil May Cry 5 leans a little harder on optimization, though the gap is small.
Devil May Cry 5
Loadouts, breakers, and enemy-specific tech reward deep study
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.