head to head
Fallout: New Vegas asks more than Shin Megami Tensei: Nocturne, and the gap is execution.

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

Optimization · Pure Optimization
Exploiting the press-turn system through demon fusion and weakness math.
Fallout: New Vegas leans Optimization (Pure Optimization); Shin Megami Tensei: Nocturne leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Shin Megami Tensei: Nocturne
Turn-based menus carry zero dexterity demands
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Shin Megami Tensei: Nocturne
Brutal bosses still run fixed scripts
Shin Megami Tensei: Nocturne leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
Shin Megami Tensei: Nocturne
Unknown boss gimmicks and fusion luck sting first attempts
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
Shin Megami Tensei: Nocturne
Press-turn exploitation and fusion planning decide everything
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.