head to head
Neither is simply harder - they are hard in different places. Portal 2 demands more execution; Star Wars: Rebellion demands more variance.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.

Optimization · Pure Optimization
A 1998 grand strategy game pitting Empire against Rebellion across a fog-shrouded galaxy.
Portal 2 leans Optimization (Pure Optimization); Star Wars: Rebellion leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Portal 2
Portal placement requires some precision but timing is lenient.
Star Wars: Rebellion
Pausable grand strategy; no hands required
Star Wars: Rebellion leans clearly harder on reads.
Portal 2
No opponent; puzzles are static.
Star Wars: Rebellion
Head-to-head play adds light human mind games
Star Wars: Rebellion leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Star Wars: Rebellion
Fog of war and hidden agent missions conceal the galaxy
Portal 2 leans a little harder on optimization, though the gap is small.
Portal 2
Solving the puzzle's logic IS the entire game.
Star Wars: Rebellion
Fleet logistics and mission scheduling reward systematic play
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.