The Silverblue, IoT and CoreOS logo are in the section "Related Projects". This is probably because all of them (not sure about IoT), including Kinoite, use rpm-ostree.
Both Silverblue and Kinoite are named after crystals.
Kinoite is like Silverblue with KDE instead of Gnome. They have separate deployment channels due to the nature of underlying technology.
Neither Silverblue nor Kinoite is considered primary variant by Fedora Project yet, because they're still rough around the edges. But I hope they will be in the future due to their advantages, which are mentioned on the first page of their respective docs [1][2] and which I have experienced myself.
The only thing I don't like is using Toolbox to manage CLI programs and the fact that `rpm-ostree install` always includes `Recommends`. I think Flatpak should handle CLI apps as well as GUI.
[1] https://docs.fedoraproject.org/en-US/fedora-silverblue/#intr...
[2] https://docs.fedoraproject.org/en-US/fedora-kinoite/#introdu...