head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

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

Optimization · Systems & Chaos
An action roguelike about mining gold, dying, and upgrading the next peasant down.
Borderlands 2 leans Optimization (Systems & Chaos); UnderMine leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands 2
Aim matters but generous hit feel
UnderMine
Pickaxe-throw combat and dodging in real time
Borderlands 2 leans a little harder on reads, though the gap is small.
Borderlands 2
Enemies are scripted loot fodder
UnderMine
Dungeon creatures are scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands 2
Procedurally generated weapon drops vary
UnderMine
Random layouts, relics, and curses each run
Borderlands 2 leans a little harder on optimization, though the gap is small.
Borderlands 2
Skill trees and gear math heavily solved
UnderMine
Relic synergies and permanent meta upgrades compound
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.