TinyLinux (booting from DOS), Slackware, Debian for many years, Ubuntu, Debian, Ubuntu, Debian, Arch for 10+ years.
RH/CentOS/Amazon Linux for work these last 20 years.
I switched to Arch because ubuntu & debian started asking too many interactive questions when upgrading packages, instead of just upgrading. Arch gets out of my way, and has great documentation if something unexpected should break.