head to head
Fallout: New Vegas asks more than Imperator: Rome, and the gap is execution.

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

Optimization · Pure Optimization
Classical-era Paradox map painter focused on pops and trade.
Fallout: New Vegas leans Optimization (Pure Optimization); Imperator: Rome leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Imperator: Rome
no mechanical demand
Imperator: Rome leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Imperator: Rome
AI scripted
Imperator: Rome leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
Imperator: Rome
events, mission paths
Imperator: Rome leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Imperator: Rome
pops, trade, mana optimization
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.