Depends on the particular job at hand. For server use I originally stuck to RHEL based distro's but Ubunutu has become a serious contender due to the built in unprivileged LXC/LXD support (No other distro supports this out of the box to my understanding).
For desktop I'm normally using Arch or Linux Mint (but trying out new distro's can be pretty fun).
What about yourself?
RE: Journaling, Markdown, and the Quest for the Best (Editor)