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

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

Optimization · Pure Optimization
A turn-based tactics game testing positioning and resource planning under hit-chance RNG.
Fallout: New Vegas leans Optimization (Pure Optimization); Rebel Cops leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Rebel Cops
Aiming is point-based, not twitch reflex
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout: New Vegas
Scripted factions and enemies
Rebel Cops
Enemy AI is scripted, not adaptive modelling
Rebel Cops leans clearly harder on variance.
Fallout: New Vegas
Some loot and crit RNG
Rebel Cops
Hit chances and detection add real randomness
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
Rebel Cops
Positioning, resource scarcity and turn planning decide missions
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.