head to head
Neither is simply harder - they are hard in different places. Fallout: New Vegas demands more execution; Rise of the Golden Idol demands more optimization.

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

Optimization · Pure Optimization
A successor deduction game demanding systematic elimination across interconnected mystery tableaux.
Fallout: New Vegas leans Optimization (Pure Optimization); Rise of the Golden Idol leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Rise of the Golden Idol
Interface identical to predecessor; no physical demands
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Rise of the Golden Idol
Scripted mystery scenes have no adaptive opponent
Rise of the Golden Idol leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
Rise of the Golden Idol
Hidden roles and motives form layered investigative uncertainty
Rise of the Golden Idol leans clearly harder on optimization.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Rise of the Golden Idol
Closed-world deduction chain converges to exactly one correct answer per scene
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.