head to head
Sins of a Solar Empire asks more than Fallout: New Vegas, and the gap is reads.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.

Optimization · Pure Optimization
A slow-burn space RTS blending 4X empire economics with massive real-time fleet battles.
Fallout: New Vegas leans Optimization (Pure Optimization); Sins of a Solar Empire leans Optimization (Pure Optimization).
Fallout: New Vegas leans a little harder on execution, though the gap is small.
Fallout: New Vegas
Shooter inputs with VATS assist
Sins of a Solar Empire
Slow real-time pace keeps the APM ceiling modest
Sins of a Solar Empire leans clearly harder on reads.
Fallout: New Vegas
Scripted factions and enemies
Sins of a Solar Empire
Multiplayer rivals adapt fleet compositions and timings
Sins of a Solar Empire leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
Sins of a Solar Empire
Fog of war hides enemy buildup
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Sins of a Solar Empire
Economy, research and fleet counters dominate outcomes
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.