head to head
Borderlands 2 asks more than Penumbra: Black Plague, and the gap is execution.

Optimization · Systems & Chaos
Loot-shooter RPG built on gear chasing.

Optimization · Systems & Chaos
Frictional's defenseless first-person horror where you solve physics puzzles while hiding from the infected.
Borderlands 2 leans Optimization (Systems & Chaos); Penumbra: Black Plague leans Optimization (Systems & Chaos).
Borderlands 2 leans clearly harder on execution.
Borderlands 2
Aim matters but generous hit feel
Penumbra: Black Plague
Physics-grab interactions need only basic mouse control
Borderlands 2 leans a little harder on reads, though the gap is small.
Borderlands 2
Enemies are scripted loot fodder
Penumbra: Black Plague
Infected patrol on scripts; hiding beats them every time
Borderlands 2 leans a little harder on variance, though the gap is small.
Borderlands 2
Procedurally generated weapon drops vary
Penumbra: Black Plague
Unknown layouts, scares, and patrols on a blind run
Borderlands 2 leans a little harder on optimization, though the gap is small.
Borderlands 2
Skill trees and gear math heavily solved
Penumbra: Black Plague
Physics puzzles and evasion routes are fully solvable
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.