What’s good about AppImages? Imo they’re the worst packaging format; you can’t install and upgrade them from the command line like with native packages or Flatpaks, there’s not a repository-like centralized place for them, they get messy quickly since there’s not really an “official” default installation path so it’s up to you to keep them organized, they don’t integrate with system themes very well and you need a separate program (AppImage Launcher) to even get them to show up as an installed program or even pin them to your taskbar.
Fedora, although I dislike SELinux and I think they should have a less strict policy with regards to FLOSS. Like, I prefer FLOSS over proprietary software, but I just wish they’d be a bit more pragmatic and allow both on the default repos and just leave it up to the user to decide what to use and what not. I guess that would also prevent dilemmas like the recent hardware acceleration drama?
Otherwise I like their balance between stability and being up to date, fast update cycle and the large amount of available packages.