Want "better" Geometry Dash? Don't use a repack. Buy the game and install Mega Hack v7 (a mod menu) or Geometry Dash World (free mobile spin-off). That is the real "better."
Geometry Dash is a rhythm-based platformer where frame rate (FPS) consistency is vital. If a pirated version claims to run "better," it usually refers to one of the following technical modifications:
Before we ask if a repack is "better," we need to understand the original.
Fact check: You can install Geometry Dash roughly 150 times in the space it takes to install one modern Call of Duty game.
Here is the first major flaw in the "FitGirl repacks geometry dash better" premise: You do not need a repack to save space. A repack is designed to solve a problem that Geometry Dash does not have.