Arch because my installs keep working, and I'm really used to it at this point. In the future I'd be interested in trying something like NixOS/Guix, Silverblue, or Qubes.
The mobile landscape is just a privacy clusterfuck. I flip flop back and forth between Android and iOS a lot. Maybe one day I'll take the Graphene plunge, not sure.
Maybe not mourn but I did have an "oh shit" moment today over a couple smaller communities where I don't know where people might scatter to. It finally sank in.