head to head
Fallout: New Vegas asks more than Emperor: Rise of the Middle Kingdom, and the gap is execution.

Optimization · Pure Optimization
Ancient China city builder about elegant housing-block logistics.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.
Emperor: Rise of the Middle Kingdom leans Optimization (Pure Optimization); Fallout: New Vegas leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Emperor: Rise of the Middle Kingdom
Pausable city placement, no pressure
Fallout: New Vegas
Shooter inputs with VATS assist
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Emperor: Rise of the Middle Kingdom
No adaptive opposition
Fallout: New Vegas
Scripted factions and enemies
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Emperor: Rise of the Middle Kingdom
Invasions and events on known schedules
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.
Emperor: Rise of the Middle Kingdom
Walker logistics and feng shui block planning
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.