head to head
Command & Conquer asks more than Fallout: New Vegas, and the gap is reads.

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

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.
Command & Conquer leans Optimization (Pure Optimization); Fallout: New Vegas 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
Fallout: New Vegas
Shooter inputs with VATS assist
Command & Conquer leans clearly harder on reads.
Command & Conquer
Human opponents scout and adapt in skirmish
Fallout: New Vegas
Scripted factions and enemies
Command & Conquer leans a little harder on variance, though the gap is small.
Command & Conquer
Fog of war hides enemy composition
Fallout: New Vegas
Some loot and crit RNG
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
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
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.