head to head
Neither is simply harder - they are hard in different places. Fallout: New Vegas demands more execution; We Were Here Together demands more variance.

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

Optimization · Pure Optimization
A two-player co-op escape adventure built on describing what only you can see over voice chat.
Fallout: New Vegas leans Optimization (Pure Optimization); We Were Here Together leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
We Were Here Together
Walking and interacting; minimal physical demand.
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
We Were Here Together
Partner is an ally; puzzles never adapt.
We Were Here Together leans clearly harder on variance.
Fallout: New Vegas
Some loot and crit RNG
We Were Here Together
Asymmetric hidden information is the core mechanic.
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
We Were Here Together
Fixed symbol-and-mechanism puzzles, fully solvable once both sides known.
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.