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.

Optimization · Pure Optimization
The genre-defining loot ARPG whose builds, runes, and trade economy players still optimize decades later.

Optimization · Systems & Chaos
Building undead squads and solving turn-based fights against the run's randomness.
Diablo II leans Optimization (Pure Optimization); Iratus: Lord of the Dead leans Optimization (Systems & Chaos).
Diablo II leans a little harder on execution, though the gap is small.
Diablo II
Positioning and potion reflexes, little else physical
Iratus: Lord of the Dead
Turn-based menus - no twitch demands at all
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Diablo II
Monster AI is fully mappable
Iratus: Lord of the Dead
Enemy parties follow scripted AI, never model you
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Diablo II
Loot RNG and random maps drive the grind
Iratus: Lord of the Dead
Minion part drops, enemy comps and hit rolls shape runs
Diablo II leans a little harder on optimization, though the gap is small.
Diablo II
Builds, breakpoints, rune economy, magic-find routing are the game
Iratus: Lord of the Dead
Necromancer squad builds and sanity-targeting math drive every fight
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.