head to head
Fallout: New Vegas asks more than Dune II, and the gap is execution.

Optimization · Pure Optimization
The 1992 template for the entire real-time strategy genre.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.
Dune II leans Optimization (Pure Optimization); Fallout: New Vegas leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Dune II
Slow clicking, no precision demands
Fallout: New Vegas
Shooter inputs with VATS assist
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Dune II
AI attacks on predictable timers
Fallout: New Vegas
Scripted factions and enemies
Dune II leans a little harder on variance, though the gap is small.
Dune II
Unscouted map and spice fields early
Fallout: New Vegas
Some loot and crit RNG
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dune II
Build orders and base economy decide everything
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
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.