head to head
Neither is simply harder - they are hard in different places. Fallout: New Vegas demands more execution; Ogre Battle 64 demands more variance.

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

Optimization · Pure Optimization
A grand tactical RPG where deep class and alignment optimization against scripted enemy formations defines mastery.
Fallout: New Vegas leans Optimization (Pure Optimization); Ogre Battle 64 leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Ogre Battle 64
Real-time unit marching is automatic; player input minimal
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Ogre Battle 64
Enemy leaders scripted; no adaptive AI
Ogre Battle 64 leans clearly harder on variance.
Fallout: New Vegas
Some loot and crit RNG
Ogre Battle 64
Unit encounter randomness and morale swings add moderate variance
Ogre Battle 64 leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Ogre Battle 64
Unit class configuration, formation, and alignment routing are the dominant system
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.