head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Practiced Mastery
Refined loot shooter with skill-tree builds.

Optimization · Practiced Mastery
Fantasy looter shooter with class hybrids.
Borderlands 3 leans Optimization (Practiced Mastery); Tiny Tina's Wonderlands leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands 3
Tighter gunplay than predecessors
Tiny Tina's Wonderlands
Gunplay similar to Borderlands 3
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands 3
Enemies scripted, no adaptive opponent
Tiny Tina's Wonderlands
Scripted fantasy enemies, no reads
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands 3
Weapon rolls and anointments randomize
Tiny Tina's Wonderlands
Loot rolls and Chaos Chamber RNG
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands 3
Skill trees, anointments, gear math deep
Tiny Tina's Wonderlands
Dual classes and spell builds deep
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.