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

Optimization · Pure Optimization
Optimising tower placement, research and economy against scripted alien waves.

Optimization · Pure Optimization
A physics puzzle game about building wobbly towers and bridges from living goo balls.
Revenge of the Titans 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.
Revenge of the Titans
Mid-wave building rewards speed but never twitch-defines outcomes
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.
Revenge of the Titans
Titan waves follow set paths without adapting
World of Goo
No opponent exists
Revenge of the Titans leans a little harder on variance, though the gap is small.
Revenge of the Titans
Wave compositions are unknown on a first campaign run
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.
Revenge of the Titans
Tech choices, placement and economy are the whole game
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.