head to head
Fallout: New Vegas asks more than Phoenix Wright: Ace Attorney, and the gap is execution.

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

Optimization · Pure Optimization
A courtroom drama where finding the single correct piece of evidence to shatter each witness's testimony is the loop.
Fallout: New Vegas leans Optimization (Pure Optimization); Phoenix Wright: Ace Attorney leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Phoenix Wright: Ace Attorney
Menu-based courtroom; zero physical skill
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Phoenix Wright: Ace Attorney
Witnesses follow scripted testimony; no adaptive opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout: New Vegas
Some loot and crit RNG
Phoenix Wright: Ace Attorney
Hidden contradictions in testimony are unknown until pressed
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Phoenix Wright: Ace Attorney
Identifying the precise contradiction and presenting the correct evidence is fully 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.