Bazzite is seeing an insane amount of growth right now
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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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To my knowledge Bazzite is basically SteamOS with more flexibility under the hood if you're looking for it. By default it boots right into big picture mode. I imagine if you get an HDMI-CEC dongle it would work great as an HTPC once you get Big Picture set up with the streaming apps.