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
A roguelike tower-defense hybrid about escorting a crystal through a randomised dungeon.
Diablo II leans Optimization (Pure Optimization); Dungeon of the Endless 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
Dungeon of the Endless
Pause-friendly control, no twitch demands
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
Dungeon of the Endless
Monster waves spawn by fixed door-opening rules
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
Dungeon of the Endless
Unknown rooms and random hero or item finds
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
Dungeon of the Endless
Dust economy and turret placement are the real 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.