head to head
Neither is simply harder - they are hard in different places. Fallout: New Vegas demands more execution; Out of the Park Baseball 20 demands more variance.

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

Optimization · Pure Optimization
A baseball management sim testing roster-building and statistical optimization over long seasons.
Fallout: New Vegas leans Optimization (Pure Optimization); Out of the Park Baseball 20 leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Out of the Park Baseball 20
No physical input; you manage, not play
Out of the Park Baseball 20 leans clearly harder on reads.
Fallout: New Vegas
Scripted factions and enemies
Out of the Park Baseball 20
AI GMs don't deeply model and adapt to you
Out of the Park Baseball 20 leans clearly harder on variance.
Fallout: New Vegas
Some loot and crit RNG
Out of the Park Baseball 20
Player performance and injuries carry real randomness
Out of the Park Baseball 20 leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Out of the Park Baseball 20
Roster construction, scouting, and strategy are the entire game
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.