head to head
Neither is simply harder - they are hard in different places. Fallout: New Vegas demands more execution; Farthest Frontier demands more variance.

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

Optimization · Pure Optimization
Building a frontier settlement where food diversity, disease prevention, and defensive layout must be solved simultaneously.
Fallout: New Vegas leans Optimization (Pure Optimization); Farthest Frontier leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Farthest Frontier
All construction and assignment decisions are deliberate and pauseable
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Farthest Frontier
Raider and animal threats follow scripted spawn rules
Farthest Frontier leans clearly harder on variance.
Fallout: New Vegas
Some loot and crit RNG
Farthest Frontier
Disease outbreaks, wild animal raids, and harvest yields add uncertainty
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Farthest Frontier
Crop rotation, food variety, and building placement are deeply 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.