head to head
Fallout: New Vegas asks more than Pokemon Crystal Version, and the gap is execution.

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

Optimization · Pure Optimization
The definitive Johto adventure, adding animated sprites and the Suicune storyline across two regions.
Fallout: New Vegas leans Optimization (Pure Optimization); Pokemon Crystal Version leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Pokemon Crystal Version
Menu-driven battles; zero hands requirement
Pokemon Crystal Version leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Pokemon Crystal Version
Scripted trainers; human link battles are optional
Pokemon Crystal Version leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
Pokemon Crystal Version
Encounter and catch RNG, shiny odds, crit rolls
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
Pokemon Crystal Version
Type charts, movesets, and two-region routing dominate
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.