head to head
Ogre Battle 64 asks more than Portal 2, and the gap is variance.

Optimization · Pure Optimization
A grand tactical RPG where deep class and alignment optimization against scripted enemy formations defines mastery.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Ogre Battle 64 leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans a little harder on execution, though the gap is small.
Ogre Battle 64
Real-time unit marching is automatic; player input minimal
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.
Ogre Battle 64
Enemy leaders scripted; no adaptive AI
Portal 2
No opponent; puzzles are static.
Ogre Battle 64 leans clearly harder on variance.
Ogre Battle 64
Unit encounter randomness and morale swings add moderate variance
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.
Ogre Battle 64
Unit class configuration, formation, and alignment routing are the dominant system
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.