head to head
Portal 2 asks more than The Elder Scrolls IV: Oblivion Remastered, and the gap is optimization.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.

Optimization · Pure Optimization
An open-world RPG whose min-maxable leveling and build system dominate over its clunky combat.
Portal 2 leans Optimization (Pure Optimization); The Elder Scrolls IV: Oblivion Remastered 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.
Portal 2
Portal placement requires some precision but timing is lenient.
The Elder Scrolls IV: Oblivion Remastered
real-time combat but forgiving swings
The Elder Scrolls IV: Oblivion Remastered leans a little harder on reads, though the gap is small.
Portal 2
No opponent; puzzles are static.
The Elder Scrolls IV: Oblivion Remastered
NPCs follow scripted AI packages
The Elder Scrolls IV: Oblivion Remastered leans a little harder on variance, though the gap is small.
Portal 2
Puzzles are deterministic with no randomness.
The Elder Scrolls IV: Oblivion Remastered
loot/leveling has some randomness
Portal 2 leans clearly harder on optimization.
Portal 2
Solving the puzzle's logic IS the entire game.
The Elder Scrolls IV: Oblivion Remastered
leveling system, builds min-maxable
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.