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
Skyscraper management sim about stacking compatible tenants atop sound infrastructure.
Caesar III leans Optimization (Pure Optimization); Project Highrise 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
Project Highrise
Calm tower planning; hands irrelevant.
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
Project Highrise
Tenants are need-driven simulation, never adaptive.
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
Project Highrise
Tenant applications and events vary slightly.
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
Project Highrise
Utility routing, tenant mix and cash flow are solvable.
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.