I am currently using EndeavourOS, but am annoyed by the constant daily updates of 1GB and pacman not installing important dependencies automatically (ex: spell checker for document editor). I like the way Fedora works: you update whenever, important dependencies are downloaded automatically, and packages are recent-ish, but I don’t like that it takes forever to run dnf. I don’t want to use Manjaro (apparently it breaks quickly?), and the distro needs to support KDE. I know about Flatpak, but I don’t want to download 1GB of data for each app. Are there any good options?
(Yes, I can probably deal with Fedora, but dnf is slower than apt, and I don’t want to deal with external repositories for non-free software.)
NixOS might interest you. It’s basically the new Arch with a much more elegant paradigm than I ever thought possible for handling conflicting dependencies. It’s the ultimate tweaker OS while miraculously also being one of the most stable.