head to head
Etrian Odyssey V: Beyond the Myth asks more than Portal 2, and the gap is variance.

Optimization · Pure Optimization
A dungeon-crawler RPG testing party building, skill optimization and careful mapping.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Etrian Odyssey V: Beyond the Myth leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans a little harder on execution, though the gap is small.
Etrian Odyssey V: Beyond the Myth
Turn-based combat needs no twitch
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.
Etrian Odyssey V: Beyond the Myth
Enemies scripted, no adaptive opponent
Portal 2
No opponent; puzzles are static.
Etrian Odyssey V: Beyond the Myth leans clearly harder on variance.
Etrian Odyssey V: Beyond the Myth
Random encounters and FOE patterns partly unknown
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.
Etrian Odyssey V: Beyond the Myth
Class building, skill trees, and mapping drive 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.