head to head
Neither is simply harder - they are hard in different places. Final Fantasy Tactics: The War of the Lions demands more variance; Portal 2 demands more execution.

Optimization · Pure Optimization
Solving job-system builds and grid positioning against mappable tactical AI.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Final Fantasy Tactics: The War of the Lions leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Final Fantasy Tactics: The War of the Lions
Turn-based menus; hands are irrelevant
Portal 2
Portal placement requires some precision but timing is lenient.
Final Fantasy Tactics: The War of the Lions leans a little harder on reads, though the gap is small.
Final Fantasy Tactics: The War of the Lions
Rare multiplayer aside, AI follows mappable behaviour
Portal 2
No opponent; puzzles are static.
Final Fantasy Tactics: The War of the Lions leans clearly harder on variance.
Final Fantasy Tactics: The War of the Lions
Hit percentages and charge interrupts add bounded randomness
Portal 2
Puzzles are deterministic with no randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Final Fantasy Tactics: The War of the Lions
Job builds, JP economy and positioning math decide everything
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.