head to head
Fallout: New Vegas asks more than Kingdom Rush 5: Alliance, and the gap is execution.

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

Optimization · Pure Optimization
A tower defense game built on optimal placement and build strategy.
Fallout: New Vegas leans Optimization (Pure Optimization); Kingdom Rush 5: Alliance leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Kingdom Rush 5: Alliance
minor click-timing for abilities
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Kingdom Rush 5: Alliance
fixed enemy waves, no adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout: New Vegas
Some loot and crit RNG
Kingdom Rush 5: Alliance
minor spawn/damage randomness
Kingdom Rush 5: Alliance leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Kingdom Rush 5: Alliance
tower placement, build optimization
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.