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 · Practiced Mastery
A looter shooter where build optimization gates raid and seasonal content.
Borderlands 2 leans Optimization (Systems & Chaos); Destiny 2 leans Optimization (Practiced Mastery).
Destiny 2 leans a little harder on execution, though the gap is small.
Borderlands 2
Aim matters but generous hit feel
Destiny 2
Gunplay matters but raids forgive mechanics.
Destiny 2 leans a little harder on reads, though the gap is small.
Borderlands 2
Enemies are scripted loot fodder
Destiny 2
PvE is scripted; Crucible has light adaptation.
Borderlands 2 leans a little harder on variance, though the gap is small.
Borderlands 2
Procedurally generated weapon drops vary
Destiny 2
Loot drops and rolls drive the chase.
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
Destiny 2
Build crafting, mods, and damage rotations dominate.
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.