head to head
Homeworld: Deserts of Kharak asks more than Portal 2, and the gap is reads.

Optimization · Pure Optimization
Ground-based Homeworld prequel about terrain-driven desert fleet warfare.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Homeworld: Deserts of Kharak leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Homeworld: Deserts of Kharak leans a little harder on execution, though the gap is small.
Homeworld: Deserts of Kharak
Dune-line positioning micro under fire
Portal 2
Portal placement requires some precision but timing is lenient.
Homeworld: Deserts of Kharak leans clearly harder on reads.
Homeworld: Deserts of Kharak
Human opponents in ranked skirmish
Portal 2
No opponent; puzzles are static.
Homeworld: Deserts of Kharak leans clearly harder on variance.
Homeworld: Deserts of Kharak
Sensor range hides enemy movements
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Homeworld: Deserts of Kharak
Terrain elevation and carrier economy are the core test
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.