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

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

Optimization · Systems & Chaos
Skill-active survivors-like with curse stacking and boss-rush escalation.
Borderlands 2 leans Optimization (Systems & Chaos); Soulstone Survivors leans Optimization (Systems & Chaos).
Borderlands 2 leans a little harder on execution, though the gap is small.
Borderlands 2
Aim matters but generous hit feel
Soulstone Survivors
Active skills and dodging beyond auto-attack.
Borderlands 2 leans a little harder on reads, though the gap is small.
Borderlands 2
Enemies are scripted loot fodder
Soulstone Survivors
Scripted enemy waves.
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
Soulstone Survivors
Skill and curse drops swing builds.
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
Soulstone Survivors
Curses and build crafting reward planning.
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.