For a/ you can use Debian testing and I think it's more or less the same. For b/ I don't install my OS often enough that it matters that much to me (I think on

For a/ you can use Debian testing and I think it's more or less the same. For b/ I don't install my OS often enough that it matters that much to me (I think on a laptop I went from Ubuntu 9.04 to 18.04 without ever re installing) These days I like old and stable and use Debian stable + backport (mostly for kernel) even for desktop, and I'm really happy :)