

So, in the end, it sounds that is better to use Secureblue as it is
It ultimately depends on what you wish out of your system. For a general use system, I can’t fathom myself preferring Bazzite over secureblue; simply for how secureblue’s superior security comforts me. However, Bazzite would definitely be preferred on a HTPC/“game-console” device. Ultimately, it depends on what you wish out of your system. As we are talking on /c/privacy, secureblue is definitely the preferred system within that context.
FWIW, secureblue has also (very recently) been approved by Privacy Guides. They’ve yet to update their recommendations page, though. It will likely be mentioned alongside Kicksecure.
since it seems to support quite a lot of the things that Bazzite does. Am I following this right?
Close enough. Usability-wise, it’s pretty smooth sailing after first setup. There are some minor things like how Waydroid works on Bazzite, but doesn’t on secureblue (at least, it didn’t when I tried it the last time). But, aside from those, it’s definitely a very viable daily driver. Just ensure to do a thorough read of their FAQ and Articles.
Have you considered Endless OS? It’s another atomic distro based on Debian. However, it’s based on the Debian stable instead of Debian unstable. Futhermore, instead of making their own tools (like Vanilla OS has done), Endless OS relies on established ones instead (like libostree, which is also found on Fedora Atomic).