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

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

Optimization · Pure Optimization
Optimizing Wielder builds and resource networks to project force in PvP or solo campaigns.
Fallout: New Vegas leans Optimization (Pure Optimization); Songs of Conquest leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Songs of Conquest
Turn-based throughout; no timing demands
Songs of Conquest leans clearly harder on reads.
Fallout: New Vegas
Scripted factions and enemies
Songs of Conquest
Human PvP multiplayer creates opponent prediction pressure
Songs of Conquest leans clearly harder on variance.
Fallout: New Vegas
Some loot and crit RNG
Songs of Conquest
Resource tile placement and battle spell procs add variance
Songs of Conquest leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Songs of Conquest
Wielder skill trees, unit stacking, and map control routing are the optimization core
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.