head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Optimization · Pure Optimization
Deterministic physics puzzles where finding the intended cut sequence is everything.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.
Cut the Rope 2 leans Optimization (Pure Optimization); Fallout: New Vegas leans Optimization (Pure Optimization).
Fallout: New Vegas leans a little harder on execution, though the gap is small.
Cut the Rope 2
Cut timing matters for three-star runs but stays forgiving
Fallout: New Vegas
Shooter inputs with VATS assist
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Cut the Rope 2
No opponent - candy physics never adapt
Fallout: New Vegas
Scripted factions and enemies
Fallout: New Vegas leans a little harder on variance, though the gap is small.
Cut the Rope 2
Levels are fully visible and deterministic
Fallout: New Vegas
Some loot and crit RNG
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
Cut the Rope 2
Finding the star-collecting solution sequence is the whole game
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.