head to head
Neither is simply harder - they are hard in different places. 911 Operator demands more variance; Fallout: New Vegas demands more execution.

Optimization · Pure Optimization
A management sim where you dispatch police, fire, and medical units while handling emergency calls.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.
911 Operator leans Optimization (Pure Optimization); Fallout: New Vegas leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
911 Operator
Mild time pressure juggling simultaneous calls
Fallout: New Vegas
Shooter inputs with VATS assist
Fallout: New Vegas leans a little harder on reads, though the gap is small.
911 Operator
Callers are scripted, never model you
Fallout: New Vegas
Scripted factions and enemies
911 Operator leans clearly harder on variance.
911 Operator
Incident types and call outcomes arrive randomly
Fallout: New Vegas
Some loot and crit RNG
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
911 Operator
Fleet placement, staffing, and dispatch protocol are solvable
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.