head to head
Resident Evil 0 asks more than Fallout: New Vegas, and the gap is variance.

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

Optimization · Pure Optimization
Survival horror prequel built on swapping two characters with no item boxes.
Fallout: New Vegas leans Optimization (Pure Optimization); Resident Evil 0 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
Resident Evil 0
Tank-control combat is modestly demanding
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Resident Evil 0
Enemies follow fixed behaviour
Resident Evil 0 leans clearly harder on variance.
Fallout: New Vegas
Some loot and crit RNG
Resident Evil 0
Hidden layouts surprise until mapped
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Resident Evil 0
Two-character item juggling makes routing the real game
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.