head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

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

Optimization · Pure Optimization
A strategy wargame pairing turn-based management of feudal Japan with real-time mass battles.
Fallout: New Vegas leans Optimization (Pure Optimization); Shogun: Total War 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
Shogun: Total War
Real-time battle micro matters but pace is forgiving
Shogun: Total War leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Shogun: Total War
Campaign AI daimyos follow mappable behaviors
Shogun: Total War leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
Shogun: Total War
Fog of war and agent rolls hide information
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
Shogun: Total War
Campaign economy, army composition and terrain are deeply solvable
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.