For me it’s PeppermintOS.
I started my Linux adventure a few years ago, and haven’t owned a Windows PC since.
I currently use Arch on my main rig, and I wanted to install Linux on two old laptops that I found laying around in my house
I then remembered the first distro I ever used, which is PeppermintOS, and I was amazed at the latest updates they released.
They even have a mini ISO now to do a net-install with no bloat, with a Debian or Devuan base.
Sadly, I believe the founder passed away a few years ago, which is why I was really happy to see the continuation of this amazing project.
How is Guix for disk user use? As soon as I install nix (the tool, not the OS), it immediately eats up 2Gb of hd space… before installing anything. I wipe the install and then forget for a few months, rinse repeat.
Guix looks a lot cleaner to me, but I haven’t tried it yet.
Maybe use btrfs, which has reduplication and compression capabilities. I never tried it in Guix but it’s like magic.