head to head
Final Fantasy XIII-2 asks more than Portal 2, and the gap is variance.

Optimization · Pure Optimization
A time-hopping JRPG sequel built on stagger combos, paradigm switching, and collecting tameable monsters.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Final Fantasy XIII-2 leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Final Fantasy XIII-2
Real-time paradigm shifts and QTEs need modest timing.
Portal 2
Portal placement requires some precision but timing is lenient.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Final Fantasy XIII-2
Boss behaviours are scripted and learnable.
Portal 2
No opponent; puzzles are static.
Final Fantasy XIII-2 leans clearly harder on variance.
Final Fantasy XIII-2
Monster drops and timeline secrets until catalogued.
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Final Fantasy XIII-2
Paradigm decks, monster builds, and stagger routing are the game.
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.