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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Because of the ubiquity, nay, monopoly of systemd I always assumed it was miles ahead of other init systems. Nope. I've been using a non-systemd environment for a while and must say I'm surprised by how little breaks, i.e., next to nothing. Moreover, boot and shutdown times are faster, and more of that good stuff. I'd suggest trying it out.
Honestly for desktop usage it doesn't really matter. All inits have their idiosyncrasies ("A stop job is running for Session"/logging hell on openrc/etc). But for managing a fleet of bare-metal servers I find systemd to be the best, most polished one out of the lot.
It matters to distro maintainers, which is why it's everywhere now.
Because systemd is exclusive.
It's also the most unsuitable for a server of all 5 of them.