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
Charming diorama puzzler about routing a jumpless Toad to each star.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Captain Toad: Treasure Tracker leans Optimization (Pure Optimization); Portal 2 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.
Captain Toad: Treasure Tracker
Gentle navigation, no jumping, light timing
Portal 2
Portal placement requires some precision but timing is lenient.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Captain Toad: Treasure Tracker
No adaptive opposition anywhere
Portal 2
No opponent; puzzles are static.
Captain Toad: Treasure Tracker leans a little harder on variance, though the gap is small.
Captain Toad: Treasure Tracker
Everything is visible and fixed
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Captain Toad: Treasure Tracker
Rotating dioramas to solve fixed route puzzles
Portal 2
Solving the puzzle's logic IS the entire game.
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.