head to head
Neither is simply harder - they are hard in different places. Fallout: New Vegas demands more execution; Oriental Empires demands more reads.

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

Optimization · Pure Optimization
A 4X strategy game testing empire economy, tech, and military planning.
Fallout: New Vegas leans Optimization (Pure Optimization); Oriental Empires leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Oriental Empires
Turn-based commands need no twitch precision
Oriental Empires leans clearly harder on reads.
Fallout: New Vegas
Scripted factions and enemies
Oriental Empires
Multiplayer rewards anticipating rivals, but AI is scripted
Oriental Empires leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
Oriental Empires
Combat and event randomness, mostly bounded
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
Oriental Empires
Economy, tech, and army development decide empires
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.