head to head
Neither is simply harder - they are hard in different places. Fallout: New Vegas demands more execution; Space Rangers 2: Dominators demands more variance.

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

Optimization · Pure Optimization
A sprawling space RPG-strategy hybrid where mastering trade, upgrades, and fleet building trumps everything else.
Fallout: New Vegas leans Optimization (Pure Optimization); Space Rangers 2: Dominators leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Space Rangers 2: Dominators
real-time combat pauses, minimal twitch skill needed
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout: New Vegas
Scripted factions and enemies
Space Rangers 2: Dominators
no adaptive human opponent in single-player sandbox
Space Rangers 2: Dominators leans clearly harder on variance.
Fallout: New Vegas
Some loot and crit RNG
Space Rangers 2: Dominators
random encounters, text quests, galaxy generation
Space Rangers 2: Dominators leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Space Rangers 2: Dominators
deep economy, tech tree, fleet build all solvable
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.