head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

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

Optimization · Pure Optimization
Methodical dungeon mapping and puzzle-solving with token real-time combat.
Fallout: New Vegas leans Optimization (Pure Optimization); Stonekeep leans Optimization (Pure Optimization).
Fallout: New Vegas leans a little harder on execution, though the gap is small.
Fallout: New Vegas
Shooter inputs with VATS assist
Stonekeep
Real-time mouse swings need only basic timing
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Stonekeep
Dungeon denizens follow fixed scripts
Stonekeep leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
Stonekeep
Unmapped corridors and secrets are scripted-but-unknown
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Stonekeep
Mapping, rune magic and inventory puzzles are the real test
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.