head to head
Fallout: New Vegas asks more than Final Fantasy XII: The Zodiac Age, and the gap is execution.

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

Optimization · Pure Optimization
An RPG where programming automated gambit systems and optimizing builds is the true skill test.
Fallout: New Vegas leans Optimization (Pure Optimization); Final Fantasy XII: The Zodiac Age leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Final Fantasy XII: The Zodiac Age
no real-time physical skill, gambit-automated
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Final Fantasy XII: The Zodiac Age
no adaptive opponents, scripted encounters
Final Fantasy XII: The Zodiac Age leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
Final Fantasy XII: The Zodiac Age
loot and encounter randomness present
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
Final Fantasy XII: The Zodiac Age
gambit and job builds are near-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.