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
Space 4X with politics and faction-specific economies.

Optimization · Pure Optimization
A meta deckbuilder where engine-building beats the scripted opponent.
Endless Space 2 leans Optimization (Pure Optimization); Inscryption 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.
Endless Space 2
turn-based
Inscryption
No reflex demands; turn-based card play.
Endless Space 2 leans a little harder on reads, though the gap is small.
Endless Space 2
AI scripted, some MP
Inscryption
Scripted opponents with light bluff moments, not true adaptation.
Inscryption leans a little harder on variance, though the gap is small.
Endless Space 2
system traits, anomalies
Inscryption
Card draws and event choices randomized.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Endless Space 2
economy, ships, populations solvable
Inscryption
Deck construction and sacrifice math drive victories.
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.