Original replier here 😁
They are all very similar.

• Fedora (Workstation) is the “OG” Fedora. It’s the oldest and most wide spread one, and often considered as the best Ubuntu alternative because of its sane defaults and big community. I used it for years and it was good.
• Silverblue is the “new” “immutable” variant. Check out my post why image based distros are so awesome. https://feddit.de/post/8234416 On the surface, it behaves exactly like the normal Fedora, but under the hood, it’s indestructible. There are other flavours of this atomic Fedora variant with KDE and more DEs too if you want.
• uBlue is basically a “tool” to make custom Fedora Atomic installs. To make very deep changes in the immutable Fedora, you have to change the image itself. And those said custom images provide huge QoL benefits and better hardware support, especially for Nvidia.
• And Bazzite is one variant of uBlue. It’s a gaming distro and provides many tweaks and tools ootb. I’m using it too on my gaming PC and the performance difference is noticeable.

I recommend Fedora Atomic because, especially uBlue, “just works”. If something should ever break, you can easily roll back. And the small tweaks provided by uBlue provide you a very sane system out of the box.
It’s way easier to learn imo than traditional systems. Yes, you might have to learn how to use distrobox, but that’s one single tool. Learning how to troubleshoot a whole OS is way harder, and you don’t have to worry about managing your OS.

What I wouldn’t recommend is Nobara. It’s a one-man-project and very very insecure. Either go with the official Fedora, or go with uBlue.