Linux Mint. Yes, it's not that interesting, but as many others point out, it just works. Both on my laptop and desktop pc. No issues for over two years.
Free and Open Source Software
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EndeavourOS on my desktop, Arch Linux on my laptop.
EndeavourOS on my desktop and laptop. Works like a charm. By far the happiest I've been with a desktop distro.
On my server VMs I'm running Ubuntu Pro because it's absolutely impeccably stable, Pro is free and I like the idea of having the option of not upgrading them for 10 years.
All running on Proxmox. I have a few appliance type VMs like opnsense and 3CX and they're nice and stable too.
endeavourOS
Q4OS, it's Debian based with KDE, it's beginner friendly. It even has a Windows installer for easy dual boot