head to head
Neither is simply harder - they are hard in different places. Final Fantasy Tactics demands more variance; Portal demands more execution.

Optimization · Pure Optimization
A deep optimization puzzle solved through job combinations and CT-manipulation on fixed maps.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Final Fantasy Tactics leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Final Fantasy Tactics
No twitch; CT-tick positioning demands spatial planning only
Portal
Portal placement timing modest.
Final Fantasy Tactics leans a little harder on reads, though the gap is small.
Final Fantasy Tactics
CPU job/action selection is fixed and fully predictable
Portal
No adversary modeling player.
Final Fantasy Tactics leans clearly harder on variance.
Final Fantasy Tactics
Random drops and some proc rates exist but rarely swing outcomes
Portal
Deterministic chambers; no randomness.
Final Fantasy Tactics leans clearly harder on optimization.
Final Fantasy Tactics
Job mastery, ability stacking, and CT manipulation are near-perfectly 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.