Does Arch Linux break?
Arch is great until it breaks, and it will break. If you want to deepen your Linux skills at debugging and repair, or just deepen your knowledge, there’s no better distribution. But if you’re just looking to get things done, Debian/Ubuntu/Fedora is a more stable option.
Which is faster Ubuntu or Mint?
Mint may seem a little quicker in use day-to-day, but on older hardware, it will definitely feel faster, whereas Ubuntu appears to run slower the older the machine gets. Mint gets faster still when running MATE, as does Ubuntu.