head to head
Neither is simply harder - they are hard in different places. Fallout: New Vegas demands more execution; Lorelei and the Laser Eyes demands more optimization.

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

Optimization · Pure Optimization
An austere puzzle labyrinth where every room presents a closed logical system that must be fully solved.
Fallout: New Vegas leans Optimization (Pure Optimization); Lorelei and the Laser Eyes leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Lorelei and the Laser Eyes
Minimal motor demand; all puzzles are cognitive
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Lorelei and the Laser Eyes
Surreal manor setting has no adaptive opponent
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
Lorelei and the Laser Eyes
Some hidden room states and obscured clues require discovery
Lorelei and the Laser Eyes leans clearly harder on optimization.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Lorelei and the Laser Eyes
Every puzzle is a precisely designed closed logic problem with exactly one valid solution
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.