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
Cult sandbox where you rise from mercenary to king through swordplay and logistics.
Fallout: New Vegas leans Optimization (Pure Optimization); Mount & Blade: Warband leans Optimization (Pure Optimization).
Mount & Blade: Warband leans a little harder on execution, though the gap is small.
Fallout: New Vegas
Shooter inputs with VATS assist
Mount & Blade: Warband
Directional blocking with a real skill ceiling
Mount & Blade: Warband leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Mount & Blade: Warband
Multiplayer melee involves human feint-reading
Mount & Blade: Warband leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
Mount & Blade: Warband
Emergent campaign events and lord politics
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
Mount & Blade: Warband
Trade routes, troop trees, and fief management are 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.