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
A deep dual-class build system where optimising passive constellations and resist thresholds is the core challenge.

Optimization · Pure Optimization
An ARPG where build crafting and skill trees define success.
Grim Dawn leans Optimization (Pure Optimization); Last Epoch 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.
Grim Dawn
Boss fights and Crucible have limited twitch demand
Last Epoch
Action combat, modest mechanical demands
Grim Dawn leans a little harder on reads, though the gap is small.
Grim Dawn
Solo and co-op PvE throughout; no adaptive opponent
Last Epoch
No adaptive opponents
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grim Dawn
Drop RNG and component rolls add moderate hidden information
Last Epoch
Loot affixes and crafting outcomes vary
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Grim Dawn
Dual-class mastery system and devotion tree are extensively solvable
Last Epoch
Build planning is the entire 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.