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
A tactical RPG where careful positioning and managing randomized combat odds decides survival.

Optimization · Pure Optimization
The 2001 Civilization entry that introduced culture, strategic resources and refined empire micromanagement.
Fire Emblem Fates: Birthright leans Optimization (Pure Optimization); Sid Meier's Civilization III leans Optimization (Pure Optimization).
Fire Emblem Fates: Birthright leans a little harder on execution, though the gap is small.
Fire Emblem Fates: Birthright
no real-time physical skill, turn-based
Sid Meier's Civilization III
No dexterity in a turn-based interface
Fire Emblem Fates: Birthright leans a little harder on reads, though the gap is small.
Fire Emblem Fates: Birthright
AI is scripted, no true adaptation
Sid Meier's Civilization III
AI personalities are fixed and mappable
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fire Emblem Fates: Birthright
hit chance rolls are heavily randomized
Sid Meier's Civilization III
Random maps, resources and combat rolls matter early
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fire Emblem Fates: Birthright
permadeath tactics and builds near-solvable
Sid Meier's Civilization III
Corruption math, worker turns and culture borders reward deep optimization
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.