Use whatever you’re comfortable with, and what you know works.
On that note, Manjaro and CachyOS don’t work. You should avoid them. They both make changes that harm reliability, and both frequently make avoidable mistakes (especially Manjaro). If you need something like those two, EndeavourOS is a better option, or just base Arch Linux.
Arch Linux itself is a good distro, but made for a specific target audience. If you want to tinker with your system and learn along the way, it may be a good option for you. If you want to “set and forget” your media center PC, a stable-release distro like Debian or Rocky might be better options for you.








CachyOS has a structure that’s much closer to Arch than Manjaro, but they still replace the majority of Arch repos with their own. I’ve seen both their repos and the optimizations they apply being the root cause of issues on some friends installs.