head to head
Fallout: New Vegas asks more than Costume Quest 2, and the gap is optimization.

Optimization · Pure Optimization
A gentle turn-based RPG testing costume-ability synergy with light timing minigames.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.
Costume Quest 2 leans Optimization (Pure Optimization); Fallout: New Vegas leans Optimization (Pure Optimization).
Fallout: New Vegas leans a little harder on execution, though the gap is small.
Costume Quest 2
Timed button presses boost attacks but stay forgiving
Fallout: New Vegas
Shooter inputs with VATS assist
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Costume Quest 2
Enemies follow fixed turn-based scripts, never adapting
Fallout: New Vegas
Scripted factions and enemies
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Costume Quest 2
Little is hidden beyond which costume drops where
Fallout: New Vegas
Some loot and crit RNG
Fallout: New Vegas leans clearly harder on optimization.
Costume Quest 2
Picking costume combos and stamps that trivialise fights is the game
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.