I use Bazzite for game development. Very rarely have I had an issue installing anything, although you sometimes do need to use brew or distrobox, and you can still layer in RPMs if you want to extend the base image pretty easily. For most users flatpak should be fine. It’s been very solid for me, and more importantly I recommend it to people who may not want to spend a lot of time troubleshooting their os. Hard to break and if you manage it, easy to roll back. I’ve been generally impressed enough with the ublue images that Aurora and Bazzite are pretty much all I recommend to people transitioning off windows.