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

Execution · Practiced Mastery
An aggressive soulslike about punishing fixed boss patterns with tight dodging.

Execution · Practiced Mastery
A precise action RPG about learning fixed boss patterns through punishing repetition.
Bloodborne leans Execution (Practiced Mastery); Dark Souls leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Bloodborne
Aggressive dodges and rally timing demand sharp hands.
Dark Souls
Timing dodges and stamina control define every encounter.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Bloodborne
Bosses follow fixed movesets; no model of you.
Dark Souls
Bosses run fixed scripted movesets; not adaptive.
Bloodborne leans a little harder on variance, though the gap is small.
Bloodborne
Chalice dungeon layouts and drops add some randomness.
Dark Souls
Minor drop-rate randomness; otherwise deterministic world.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Bloodborne
Builds, weapons, and boss patterns are studyable and solvable.
Dark Souls
Builds, routes, and boss patterns are fully learnable.
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.