head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Pure Optimization
Classic Roman city builder dominated by mastering its walker-based logistics.

Optimization · Pure Optimization
Organic-grid medieval city-builder driven by zoning and chains.
Caesar III leans Optimization (Pure Optimization); Foundation 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.
Caesar III
Mouse-driven building, no pressure
Foundation
no twitch
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Caesar III
Invasions are scheduled, not adaptive
Foundation
no opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Caesar III
Minor walker pathing unpredictability
Foundation
map terrain
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Caesar III
Housing blocks and walker logistics are solvable systems
Foundation
zoning, supply chains, ratios
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.