head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

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

Optimization · Pure Optimization
A timing-flavoured turn-based RPG where party builds and learned attack patterns decide fights.
Fallout: New Vegas leans Optimization (Pure Optimization); Mario & Luigi: Paper Jam 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.
Fallout: New Vegas
Shooter inputs with VATS assist
Mario & Luigi: Paper Jam
Timed action commands reward but never gate progress
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Mario & Luigi: Paper Jam
Enemy attacks are scripted tells, not adaptive minds
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
Mario & Luigi: Paper Jam
Minor drop and damage rolls inside fixed encounters
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Mario & Luigi: Paper Jam
Gear, badge and turn-order planning carries every fight
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.