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

Optimization · Pure Optimization
A maze-building tower defense about optimizing tower placement against scripted enemy waves.
Caesar III leans Optimization (Pure Optimization); Fieldrunners 2 leans Optimization (Pure Optimization).
Fieldrunners 2 leans a little harder on execution, though the gap is small.
Caesar III
Mouse-driven building, no pressure
Fieldrunners 2
Placing towers - no twitch dimension
Fieldrunners 2 leans a little harder on reads, though the gap is small.
Caesar III
Invasions are scheduled, not adaptive
Fieldrunners 2
Enemies follow fixed paths, not adaptation
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
Fieldrunners 2
Wave composition scripted-but-unknown first time
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
Fieldrunners 2
Maze layouts and tower mixes are the solvable puzzle
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.