head to head
Borderlands 2 asks more than XCOM: Enemy Unknown, and the gap is execution.

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

Optimization · Systems & Chaos
Managing RNG-driven combat while solving the underlying base economy and research tree.
Borderlands 2 leans Optimization (Systems & Chaos); XCOM: Enemy Unknown leans Optimization (Systems & Chaos).
Borderlands 2 leans clearly harder on execution.
Borderlands 2
Aim matters but generous hit feel
XCOM: Enemy Unknown
Turn-based; no twitch inputs; cover placement has mild precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands 2
Enemies are scripted loot fodder
XCOM: Enemy Unknown
Aliens follow scripted AI, never model your specific habits
XCOM: Enemy Unknown leans a little harder on variance, though the gap is small.
Borderlands 2
Procedurally generated weapon drops vary
XCOM: Enemy Unknown
Hit chances, crit rolls, and mission spawns create constant RNG swings
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands 2
Skill trees and gear math heavily solved
XCOM: Enemy Unknown
Squad composition, research order, and base economy are 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.