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
Team-building and type-matchup optimization, with RNG layers and optional human prediction online.

Optimization · Pure Optimization
Deep empire optimisation over a hidden map against mappable AI.
Pokémon White Version 2 leans Optimization (Pure Optimization); Sid Meier's Civilization IV leans Optimization (Pure Optimization).
Pokémon White Version 2 leans a little harder on execution, though the gap is small.
Pokémon White Version 2
Turn-based menus remove any physical ceiling
Sid Meier's Civilization IV
Turn-based clicks have no physical ceiling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon White Version 2
Optional human PvP adds prediction; campaign AI is scripted
Sid Meier's Civilization IV
Human multiplayer adds diplomacy reads; AI is mappable
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon White Version 2
Encounter rolls, catches and damage ranges shape runs
Sid Meier's Civilization IV
Map generation and unrevealed terrain drive early decisions
Sid Meier's Civilization IV leans a little harder on optimization, though the gap is small.
Pokémon White Version 2
Type matchups, EV training and team building are solvable math
Sid Meier's Civilization IV
Tech paths, tile yields and expansion math dominate outcomes
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.