head to head
Fallout: New Vegas asks more than Riven: The Sequel to Myst, 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 cerebral puzzle-adventure that is essentially a logic puzzle to be fully solved.
Fallout: New Vegas leans Optimization (Pure Optimization); Riven: The Sequel to Myst leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Fallout: New Vegas
Shooter inputs with VATS assist
Riven: The Sequel to Myst
no reflex or physical skill required
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Riven: The Sequel to Myst
no opponent present in the game
Fallout: New Vegas leans clearly harder on variance.
Fallout: New Vegas
Some loot and crit RNG
Riven: The Sequel to Myst
fully deterministic puzzle world
Riven: The Sequel to Myst leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Riven: The Sequel to Myst
pure logic-puzzle solving, walkthrough-solvable
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.