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
A moon-set Borderlands entry adding low gravity and oxygen mechanics.

Optimization · Practiced Mastery
Fighting and building at insect scale by learning fixed creature patterns and optimising gear choices.
Borderlands: The Pre-Sequel leans Optimization (Practiced Mastery); Grounded 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: The Pre-Sequel
Low-gravity movement and aim are moderate demands
Grounded
Bug combat demands precise dodge timing and weapon choice
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands: The Pre-Sequel
Scripted enemies only
Grounded
Insect AI is scripted; no adaptive opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands: The Pre-Sequel
Loot RNG remains central
Grounded
Creature spawn and loot drops carry session-level randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Borderlands: The Pre-Sequel
Oz-kit builds and gear synergy decide power
Grounded
Base placement, gear progression, and creature weaknesses 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.