head to head
Fallout: New Vegas asks more than Pokemon HeartGold Version, and the gap is execution.

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

Optimization · Pure Optimization
The beloved DS remake of Johto with walking companions and both Johto and Kanto to conquer.
Fallout: New Vegas leans Optimization (Pure Optimization); Pokemon HeartGold Version leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Pokemon HeartGold Version
Menu battles; no physical skill tested
Pokemon HeartGold Version leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Pokemon HeartGold Version
Scripted trainer AI; online battles optional
Pokemon HeartGold Version leans a little harder on variance, though the gap is small.
Fallout: New Vegas
Some loot and crit RNG
Pokemon HeartGold Version
Encounter RNG, catch rates, Pokewalker luck
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
Pokemon HeartGold Version
Sixteen badges of team building and matchup planning
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.