head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Pure Optimization
A physics sandbox testing track design to guide a sledder along drawn lines.

Optimization · Pure Optimization
A physics puzzle game about building wobbly towers and bridges from living goo balls.
Line Rider 2: Unbound leans Optimization (Pure Optimization); World of Goo leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Line Rider 2: Unbound
Drawing tracks has no twitch dimension
World of Goo
Placing goo balls needs only mild precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Line Rider 2: Unbound
Solo physics sandbox with no opponent
World of Goo
No opponent exists
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Line Rider 2: Unbound
Deterministic physics, nothing random
World of Goo
Physics are visible and deterministic
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Line Rider 2: Unbound
Designing tracks that produce desired sled physics is the puzzle
World of Goo
Tower structure and goo economy are solvable per level
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.