I purposely left out both, for a plethora of reasons.
Manjaro, while relatively easy to Arch, is something that can get difficult to maintain long-term, especially for a new Linux user. I didn't include Mint, not even because I think they are idiotic to remove Snapd but for the ease of removing higher levels of choice and thought, Manjaro is also kicked out of the list for that reason.
The specific reasons I picked Ubuntu are quite simple:
Ubuntu is developed by a large corporation
Ubuntu is already fairly well known by non-Linux users
Ubuntu has the largest userbase
Ubuntu won't require any workarounds for anything supported by Debian
Ubuntu has a massive user-base, that can help ANY issue without having to worry about compatibility with a derivative (like PPAs in elementaryOS (last I checked), and Snapd in Linux Mint) or a separate distribution (like Fedora and Manjaro).
In short, Ubuntu is the better choice to pick for a tutorial like this.
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I purposely left out both, for a plethora of reasons.
Manjaro, while relatively easy to Arch, is something that can get difficult to maintain long-term, especially for a new Linux user. I didn't include Mint, not even because I think they are idiotic to remove Snapd but for the ease of removing higher levels of choice and thought, Manjaro is also kicked out of the list for that reason.
The specific reasons I picked Ubuntu are quite simple:
In short, Ubuntu is the better choice to pick for a tutorial like this.