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
Foundational real-time strategy of harvesting tiberium and out-building your rival.

Optimization · Pure Optimization
A harsh old-school MMORPG where full-loot PvP reads and deep hunting-route optimisation define survival.
Command & Conquer leans Optimization (Pure Optimization); Tibia leans Optimization (Pure Optimization).
Command & Conquer leans a little harder on execution, though the gap is small.
Command & Conquer
Click speed and unit micro matter
Tibia
Full-loot hunting and PvP require manual targeting and spell usage
Command & Conquer leans a little harder on reads, though the gap is small.
Command & Conquer
Human opponents scout and adapt in skirmish
Tibia
Open-world PvP and ganking involve reading real human opponents
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Command & Conquer
Fog of war hides enemy composition
Tibia
Rare loot drop rates drive extreme grind variance
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Command & Conquer
Build orders and tiberium economy dominate
Tibia
Vocation builds, spawn routing, and task management are extensively solved
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.