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

Optimization · Pure Optimization
Time-loop assassin puzzle where each day refines the perfect chain.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.
Deathloop leans Optimization (Pure Optimization); Fallout: New Vegas leans Optimization (Pure Optimization).
Deathloop leans a little harder on execution, though the gap is small.
Deathloop
Gunplay and slab timing required.
Fallout: New Vegas
Shooter inputs with VATS assist
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Deathloop
Visionaries scripted; PvP invasions rare.
Fallout: New Vegas
Scripted factions and enemies
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Deathloop
Loadout drops and Julianna invasions randomize.
Fallout: New Vegas
Some loot and crit RNG
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Deathloop
Time-loop puzzle - chaining kills is solvable routing.
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.