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 · Systems & Chaos
Blizzard's mobile Diablo where loot RNG and paid gem systems drive character power.

Optimization · Pure Optimization
A colorful loot ARPG where theorycrafting builds beats anything your hands do.
Diablo Immortal leans Optimization (Systems & Chaos); Torchlight II leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Diablo Immortal
Touch-friendly combat with dodge timing
Torchlight II
Faster combat asks for dodging and skill timing
Diablo Immortal leans a little harder on reads, though the gap is small.
Diablo Immortal
PvP battlegrounds exist but gear usually decides
Torchlight II
Enemies are scripted swarms, never adaptive
Diablo Immortal leans a little harder on variance, though the gap is small.
Diablo Immortal
Legendary gem and loot RNG, heavily monetized
Torchlight II
Loot rolls and random maps drive the chase
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Diablo Immortal
Resonance, paragon, set optimization dominate power
Torchlight II
Skill trees and gear synergies decide character power
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.