I would guess it depends on the environment you operate in, but it feels to me (emphasis on feels) that the top two are RHEL and Debian. Both are very stable, t

I would guess it depends on the environment you operate in, but it feels to me (emphasis on feels) that the top two are RHEL and Debian. Both are very stable, tested, and have tons of community support. 1. RHEL: Despite recent business/licensing shenanigans they still sponsor an enormous amount of work that benefits the whole open source community. Very big in enterprises, web hosting, and most cloud providers. Has multiple "cousin" distros like Fedora, CentOS Stream, Rocky, and Alma if you have no need or want to be a direct Red Hat customer. 2. Debian: Has a pretty old-school development process, which results in a very stable general purpose Linux-based OS with a (somewhat) predictable release cycle and very few frills or non-essential baggage. More popular among those who shy away from distros with commercial attachment because the Debian community leans toward Free Software (in the GNU sense). Quite popular in embedded and small systems (e.g. Raspberry Pi), cloud images, and containers. The upstream for a number of other quite popular distros.