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
The original Souls game: scripted boss patterns you solve with builds, routes and disciplined execution.

Optimization · Practiced Mastery
Breakout Monster Hunter where learning each beast's moveset turns terror into routine.
Demon's Souls leans Execution (Practiced Mastery); Monster Hunter: World leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Demon's Souls
Stamina-timed dodges and parries punish sloppy hands.
Monster Hunter: World
Deliberate weapon timing against huge movesets
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Demon's Souls
Invasions exist but bosses are scripted patterns.
Monster Hunter: World
Monsters are learnable scripts, never adaptive
Monster Hunter: World leans a little harder on variance, though the gap is small.
Demon's Souls
World tendency and upgrade drops add mild noise.
Monster Hunter: World
Decoration drops are notorious RNG
Monster Hunter: World leans a little harder on optimization, though the gap is small.
Demon's Souls
Builds, routes and learned movesets are fully solvable.
Monster Hunter: World
Knowing the monster and building counters is the game
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.