In my experience, the Debian installer is just confusing. Once you’re past that, the userbase is smaller than Ubuntu’s. Their repos are different too, meaning software packaged for Ubuntu isn’t guaranteed to work on Debian. Ubuntu itself is pretty terrible for its own reasons, so when asked for a desktop Linux distribution “close to Ubuntu” I’d put Mint first. (For general recommendation, I’d probably say Fedora now.)

Debian 13 is still relatively new, so the problems of it being out of date aren’t showing yet. Debian 12 just before 13 released had tons of these issues, like glibc being too old for some binary programs, or the kernel not being new enough for some “gaming” features.

For reference, I am on Arch Linux. I feel I have a good understanding of how to manually install Linux. The Debian installer confused me in many ways, the main one being that “language and region” are closely tied, and selecting en_US “language” forces you to choose an American timezone later in the installer. In general it was a slow install process too. This is something other “user friendly” distros handle much better. A default live environment, a quick installation, and options being there, but having the defaults automatically correct (like timezone).

Like (almost) every other distro, Debian has its own benefits and downsides. These make it a good fit on desktop for slightly more experienced users, or users familiar with apt. This means it isn’t in the list of distros I’d generally recommend to people when they’re not familiar with Linux.

Matrix (Synapse with Element) can be self-hosted for free, though they have optional paid plans for enterprises. The main goal of Matrix is federation (connecting with other servers), though this can be turned off completely. This is probably the most “business” look/feel you can get fully FOSS, if that’s what you’re looking for.

XMPP has more clients/servers, and is more for the technically oriented end user. I can’t really give recommendations here, as I haven’t extensively used XMPP.

Spacebar (formerly Fosscord) is a Discord clone (API compatibility as a goal) that can be selfhosted.

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.

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.