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No idea! Debian proper? Fedora? Nix? Arch?..

(I personally run a relatively niche distro, https://voidlinux.org/)

Arch

Void's great although definitely for the tinker crowd (like arch was), debian seems like the better community choice

The transition from Ubuntu to Debian is about as simple as it gets, since Ubuntu derives much of their base from Debian..

As someone said, "Ubuntu is Debian-based like milk is grass-based" :)

But certainly the bulk of the tools must be familiar.

Perhaps not exactly 'community distro', but Fedora is genuinely a joy to use.

Linux Mint of course