head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, and it is a single point.

Optimization · Pure Optimization
Story-heavy deckbuilder of clashing dice and floor-by-floor library combat.

Optimization · Pure Optimization
Engineer a pandemic; evolution order is the puzzle.
Library of Ruina leans Optimization (Pure Optimization); Plague Inc: Evolved 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.
Library of Ruina
Turn-based card combat, no input precision.
Plague Inc: Evolved
no reflex
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Library of Ruina
Scripted enemy decks, no adaptive opponent.
Plague Inc: Evolved
world response scripted
Library of Ruina leans a little harder on variance, though the gap is small.
Library of Ruina
Dice rolls and draws swing fights moderately.
Plague Inc: Evolved
country event timing
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Library of Ruina
Deck construction and clash math is deeply solvable.
Plague Inc: Evolved
evolution order heavily solved
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.