head to head
Stronghold HD 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
Castle economy and siege engineering with light real-time micro.
Fallout: New Vegas leans Optimization (Pure Optimization); Stronghold HD 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
Stronghold HD
Real-time micro matters in sieges but stays modest
Stronghold HD leans clearly harder on reads.
Fallout: New Vegas
Scripted factions and enemies
Stronghold HD
Multiplayer sieges reward predicting human attack angles
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout: New Vegas
Some loot and crit RNG
Stronghold HD
Campaign events scripted; small skirmish unknowns
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Stronghold HD
Castle economy and siege engineering are the dominant layer
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.