system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why were some clones better than others? How were they ranked?

Why were some clones like Captain Rex and Commander Cody so much more skilled than other clones? How did they become much higher ranks than the others? Wouldn’t all the clones be equally skilled since they’re all the same person that go through the same training?
gpt
Clones are genetically identical but they aren't the same person. Their personalities vary - almost all have the minimum competence to be a soldier, but some are more competent and more determined to take leadership roles or specialize (clones often opted into specializations and received advanced training).

Edit: forgot to mention that clones were created in batches/generations. Older clones (like Rex and Cody) had more opportunity to rise up the ranks while Kamino was still pumping out fresh batches of shinies to serve as their subordinates.