Tails isn't really a security focused distro, no significant kernel or other security hardening. It is amnesic. Whonix (based on Kicksecure) is security hardened but still based on Debian which isn't great for a security base.
Secureblue is what I would recommend because it a security focused Linux distro that benefits from Fedora's SELinux, and has a bunch of its own additions.
QubesOS is obviously the best for security. Combine that with a Whonix or Secureblue guest OS and you're perfect.