head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Optimization · Pure Optimization
Alternate-history RTS where economy management and build orders win wars.

Optimization · Mind & Math
Castle economics RTS where supply chain optimization and defensive geometry are tested against escalating siege pressure.
Command & Conquer: Red Alert leans Optimization (Pure Optimization); Stronghold: Crusader leans Optimization (Mind & Math).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Command & Conquer: Red Alert
Micro and base management under time pressure
Stronghold: Crusader
Troop rally timing and siege placement require practiced attention
Stronghold: Crusader leans a little harder on reads, though the gap is small.
Command & Conquer: Red Alert
PvP skirmish rewards predicting enemy pushes
Stronghold: Crusader
Opponent lord AI has semi-scripted but varied attack patterns
Stronghold: Crusader leans a little harder on variance, though the gap is small.
Command & Conquer: Red Alert
Fog of war conceals army composition
Stronghold: Crusader
Goods market prices and siege equipment availability fluctuate
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Command & Conquer: Red Alert
Ore economy and build orders decide games
Stronghold: Crusader
Castle layout and goods production chains are deeply optimizable
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.