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
A number-stacking playground where grinding and build optimisation dwarf everything else.
Caesar III leans Optimization (Pure Optimization); Disgaea 4 Complete+ 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
Disgaea 4 Complete+
Turn-based menus - hands are never the bottleneck
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
Disgaea 4 Complete+
Enemy AI is fixed scripts, never models the player
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
Disgaea 4 Complete+
Item World layouts and drops randomise but average out
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
Disgaea 4 Complete+
Stacking multipliers into million-damage builds is the entire endgame
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.