head to head
Dune: Spice Wars asks more than Portal 2, and the gap is reads.

Optimization · Pure Optimization
A 4X-strategy hybrid about controlling Arrakis through economy and intrigue.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Dune: Spice Wars leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans a little harder on execution, though the gap is small.
Dune: Spice Wars
Low-APM real-time control
Portal 2
Portal placement requires some precision but timing is lenient.
Dune: Spice Wars leans clearly harder on reads.
Dune: Spice Wars
Human multiplayer politics adapt; AI doesn't
Portal 2
No opponent; puzzles are static.
Dune: Spice Wars leans clearly harder on variance.
Dune: Spice Wars
Map layout, sandworms, and hidden intel
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Dune: Spice Wars
Spice economy, councils, and tech are deeply optimizable
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.