head to head
Fallout: New Vegas asks more than Observer: System Redux, and the gap is execution.

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

Optimization · Pure Optimization
A cyberpunk detective horror game solved primarily by methodical clue reading and narrative comprehension.
Fallout: New Vegas leans Optimization (Pure Optimization); Observer: System Redux leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Observer: System Redux
Cyberpunk investigation; minimal twitch requirement
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Observer: System Redux
No opponents; purely environmental storytelling
Observer: System Redux leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
Observer: System Redux
Some dream-maze sections have semi-random layouts
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Observer: System Redux
Clue sequencing and mind-dive navigation are fully learnable
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.