Personally, my transition from Garuda to BigLinux has been great, I haven’t had any problems using Fish or Starship, and about snapshots I really only use the default one from BigLinux, and when I upgrade with significant changes I just do a manual snapshot and that’s it.
(I have to admit that I tried to configure Snapper but did not succeed, although I should try again.)
In terms of performance, BigLinux is much faster (in my case, with Nvidia GPU) than GarudaLinux, Garuda had the habit of lagging very easily (in X11), by simply putting a window with the sticky effect on one edge of the screen, the system was stuck for a second or two… Trying to solve this problem I came to nothing, deactivating effects, changing compositor, kernel, activating triple buffering and a thousand things more…
This is where BigLinux completely solved my performance problems (I have no idea how) that I had in Garuda, and even in pure Manjaro or Arch itself I suffered from that… In fact I had to migrate to Debian for a couple of months until I met BigLinux, which fixed all the problems I had, and now I can enjoy all the advantages of Arch, practically out-of-the-box, because I don’t need to apply many changes for those things that Garuda had, which I loved, to be adapted by BigLinux.
I also have to mention a single problem I had with BigLinux, and that is that one day I changed the default theme and used another one, and from that moment on it seems that all the performance improvements that are applied by default in BigLinux, were erased or something happened, because not even using Timeshift (which apparently did not save my files from the Home directory) or applying “Defaults” in the BigLinux control panel corrected this, I had to reinstall the OS completely to return that “improvement” in performance, because in fact I had the same problems as with Garuda. ..
Oh, and the BigLinux forums are God’s envoy for Arch newbies, they always try to help you and not only ask you for a complete log of your PC to tell you that your PC is too bad to run their OS, almost the same as Windows…