head to head
ARK: Survival Evolved asks more than Fallout: New Vegas, and the gap is reads.

Optimization · Pure Optimization
A dinosaur survival game about taming, building, and tribal warfare on a hostile island.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.
ARK: Survival Evolved leans Optimization (Pure Optimization); Fallout: New Vegas leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
ARK: Survival Evolved
Shooting and kiting matter in raids
Fallout: New Vegas
Shooter inputs with VATS assist
ARK: Survival Evolved leans clearly harder on reads.
ARK: Survival Evolved
Tribe warfare involves human deception and politics
Fallout: New Vegas
Scripted factions and enemies
ARK: Survival Evolved leans clearly harder on variance.
ARK: Survival Evolved
Taming rolls, spawns, and surprise raids
Fallout: New Vegas
Some loot and crit RNG
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
ARK: Survival Evolved
Breeding lines, base design, and farming dominate
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.