head to head
Neither is simply harder - they are hard in different places. Portal 2 demands more execution; Stranger of Sword City demands more variance.

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

Optimization · Pure Optimization
Party-build optimisation and risk management in a punishing turn-based dungeon crawl.
Portal 2 leans Optimization (Pure Optimization); Stranger of Sword City leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Portal 2
Portal placement requires some precision but timing is lenient.
Stranger of Sword City
Turn-based menus carry no physical demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
No opponent; puzzles are static.
Stranger of Sword City
Monsters follow fixed logic with no adaptation
Stranger of Sword City leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Stranger of Sword City
Encounter rolls, drops and permadeath risk shape runs
Portal 2 leans a little harder on optimization, though the gap is small.
Portal 2
Solving the puzzle's logic IS the entire game.
Stranger of Sword City
Party builds, class changes and risk management are the 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.