It doesn't matter that much, if you learn one, you have learned 99% of the other. Most noticeable difference is package manager, and lesser noticeable differen

It doesn't matter that much, if you learn one, you have learned 99% of the other. Most noticeable difference is package manager, and lesser noticeable differences are locations of some system files for which you will need to read documentation anyways. I would recommend Arch-based Linux distributions like Manjaro, because package manager is way more user-friendly imo.