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 classic Korean grind MMORPG where drop luck and stat planning eclipse moment-to-moment skill.

Optimization · Pure Optimization
An original RPG system where engagement optimization and passive-stacking theory dominate hard-mode encounters.
MU Online leans Optimization (Pure Optimization); Pillars of Eternity 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.
MU Online
Click-to-kill grinding with minimal mechanical demand.
Pillars of Eternity
Real-time-with-pause removes all twitch pressure from the player
MU Online leans a little harder on reads, though the gap is small.
MU Online
Open PK adds occasional human conflict.
Pillars of Eternity
All AI opponents use fixed scripted behaviour trees
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
MU Online
Item drops and upgrade gambling drive the chase.
Pillars of Eternity
Hidden enemy immunities and ability distributions require investigation
Pillars of Eternity leans a little harder on optimization, though the gap is small.
MU Online
Stat allocation, spot farming, and gear paths are solvable grind.
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.