head to head
WoW Classic asks more than Fallout: New Vegas, and the gap is reads.

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

Optimization · Pure Optimization
A slower, more deliberate MMORPG where optimal preparation and class knowledge define performance.
Fallout: New Vegas leans Optimization (Pure Optimization); WoW Classic leans Optimization (Pure Optimization).
WoW Classic leans a little harder on execution, though the gap is small.
Fallout: New Vegas
Shooter inputs with VATS assist
WoW Classic
Slower combat reduces twitch ceiling versus retail
WoW Classic leans clearly harder on reads.
Fallout: New Vegas
Scripted factions and enemies
WoW Classic
World PvP and battlegrounds involve real human prediction
WoW Classic leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
WoW Classic
Resist RNG and gear drops add meaningful hidden 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
WoW Classic
Class specs, consumable lists, and dungeon routes are deeply 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.