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

Optimization · Pure Optimization
Turn-based mech tactics where lance builds and heat math decide drawn-out slugfests.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.
BattleTech leans Optimization (Pure Optimization); Fallout: New Vegas leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
BattleTech
Turn-based; no physical inputs matter
Fallout: New Vegas
Shooter inputs with VATS assist
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
BattleTech
AI lances follow exploitable scripted behavior
Fallout: New Vegas
Scripted factions and enemies
BattleTech leans clearly harder on variance.
BattleTech
To-hit rolls and component crits swing fights
Fallout: New Vegas
Some loot and crit RNG
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
BattleTech
Mech builds, heat management, and initiative play
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
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.