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
Tests creative tool-combination puzzle solving across a metroidvania sandbox.
Fallout: New Vegas leans Optimization (Pure Optimization); Supraland: Six Inches Under 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
Supraland: Six Inches Under
First-person platforming and light combat need modest precision
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Supraland: Six Inches Under
Solo world with no adaptive adversary
Fallout: New Vegas leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
Supraland: Six Inches Under
Secrets are scripted-but-unknown until discovered
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Supraland: Six Inches Under
Chaining ability tools into puzzle solutions is the core test
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.