head to head
Dark Cloud 2 asks more than Fallout: New Vegas, and the gap is variance.

Optimization · Pure Optimization
Beloved sequel layering invention, photography, and town-building onto dungeon runs.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.
Dark Cloud 2 leans Optimization (Pure Optimization); Fallout: New Vegas leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dark Cloud 2
dodge-and-strike combat plus photo hunting
Fallout: New Vegas
Shooter inputs with VATS assist
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Dark Cloud 2
no adaptive opponent
Fallout: New Vegas
Scripted factions and enemies
Dark Cloud 2 leans clearly harder on variance.
Dark Cloud 2
procedural dungeons and invention drops
Fallout: New Vegas
Some loot and crit RNG
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
Dark Cloud 2
weapon synthesis and Georama building run deep
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.