head to head
Neither is simply harder - they are hard in different places. Persona Q: Shadow of the Labyrinth demands more variance; Portal demands more execution.

Optimization · Pure Optimization
Etrian-style crossover crawler where party builds and careful map routing carry the labyrinth.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Persona Q: Shadow of the Labyrinth leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Persona Q: Shadow of the Labyrinth
First-person grid crawl; menus only.
Portal
Portal placement timing modest.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Persona Q: Shadow of the Labyrinth
FOEs follow fixed patrol patterns.
Portal
No adversary modeling player.
Persona Q: Shadow of the Labyrinth leans clearly harder on variance.
Persona Q: Shadow of the Labyrinth
Boost procs and drops add minor noise.
Portal
Deterministic chambers; no randomness.
Persona Q: Shadow of the Labyrinth leans a little harder on optimization, though the gap is small.
Persona Q: Shadow of the Labyrinth
Sub-persona builds, map drawing, and FOE puzzles are solvable.
Portal
Pure puzzle-solving optimization.
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.