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.

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

Optimization · Systems & Chaos
Optimizing Grey Knight loadouts and campaign decisions against escalating Bloom infection timers.
Diablo II leans Optimization (Pure Optimization); Warhammer 40,000: Chaos Gate - Daemonhunters leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Diablo II
Positioning and potion reflexes, little else physical
Warhammer 40,000: Chaos Gate - Daemonhunters
Turn-based; Willpower and cover angle require spatial not twitch skill
Warhammer 40,000: Chaos Gate - Daemonhunters leans a little harder on reads, though the gap is small.
Diablo II
Monster AI is fully mappable
Warhammer 40,000: Chaos Gate - Daemonhunters
Chaos AI follows scripted threat escalation patterns
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
Warhammer 40,000: Chaos Gate - Daemonhunters
Nemesis Force activations, random Bloom spread, and loot drops create variance
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
Warhammer 40,000: Chaos Gate - Daemonhunters
Grey Knight wargear, psychic powers, and campaign priority are tightly optimizable
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.