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

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

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.
Command & Conquer: Red Alert leans Optimization (Pure Optimization); Fallout: New Vegas leans Optimization (Pure Optimization).
Command & Conquer: Red Alert leans a little harder on execution, though the gap is small.
Command & Conquer: Red Alert
Micro and base management under time pressure
Fallout: New Vegas
Shooter inputs with VATS assist
Command & Conquer: Red Alert leans clearly harder on reads.
Command & Conquer: Red Alert
PvP skirmish rewards predicting enemy pushes
Fallout: New Vegas
Scripted factions and enemies
Command & Conquer: Red Alert leans a little harder on variance, though the gap is small.
Command & Conquer: Red Alert
Fog of war conceals army 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: Red Alert
Ore economy and build orders decide games
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.