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
Sprawling tactical dungeon crawler where managing a dwindling hand of cards decides everything.

Optimization · Pure Optimization
An original RPG system where engagement optimization and passive-stacking theory dominate hard-mode encounters.
Gloomhaven leans Optimization (Pure Optimization); Pillars of Eternity leans Optimization (Pure Optimization).
Pillars of Eternity leans a little harder on execution, though the gap is small.
Gloomhaven
Turn-based; zero dexterity demand
Pillars of Eternity
Real-time-with-pause removes all twitch pressure from the player
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Gloomhaven
Monster AI follows printed, mappable rules
Pillars of Eternity
All AI opponents use fixed scripted behaviour trees
Gloomhaven leans a little harder on variance, though the gap is small.
Gloomhaven
Modifier deck and monster ability draws
Pillars of Eternity
Hidden enemy immunities and ability distributions require investigation
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Gloomhaven
Card economy and scenario routing are the game
Pillars of Eternity
Per-encounter ability management and passive stacking define trial-of-iron mastery
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.