head to head
Fallout: New Vegas asks more than Dragon Quest VIII: Journey of the Cursed King, and the gap is execution.

Optimization · Pure Optimization
A warm, classic JRPG adventure with deep alchemy crafting.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.
Dragon Quest VIII: Journey of the Cursed King leans Optimization (Pure Optimization); Fallout: New Vegas leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Dragon Quest VIII: Journey of the Cursed King
Turn-based menus, zero dexterity
Fallout: New Vegas
Shooter inputs with VATS assist
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Dragon Quest VIII: Journey of the Cursed King
Monsters act on fixed logic
Fallout: New Vegas
Scripted factions and enemies
Dragon Quest VIII: Journey of the Cursed King leans a little harder on variance, though the gap is small.
Dragon Quest VIII: Journey of the Cursed King
Battle RNG, drops, and casino luck
Fallout: New Vegas
Some loot and crit RNG
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
Dragon Quest VIII: Journey of the Cursed King
Skill points, alchemy, and tension are optimizable
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.