head to head
Mount & Blade II: Bannerlord asks more than Portal 2, and the gap is variance.

Optimization · Pure Optimization
Sandbox medieval sim spanning personal swordplay up to running a kingdom's economy.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Mount & Blade II: Bannerlord leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Mount & Blade II: Bannerlord leans clearly harder on execution.
Mount & Blade II: Bannerlord
Directional melee blocking and mounted combat
Portal 2
Portal placement requires some precision but timing is lenient.
Mount & Blade II: Bannerlord leans clearly harder on reads.
Mount & Blade II: Bannerlord
Multiplayer duels add some human prediction
Portal 2
No opponent; puzzles are static.
Mount & Blade II: Bannerlord leans clearly harder on variance.
Mount & Blade II: Bannerlord
Procedural campaign politics and battles
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Mount & Blade II: Bannerlord
Economy, army composition, and kingdom management dominate
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.