Fedora SilverBlue is awesome, but I think Workstation would be the best choice for now. One con of SB for me is flatpak, its packages take a lot of space. I did not check the what’s going to be of F32 SB yet. Which juice things they added to it?.
If you’re using two separate disks to dual boot in an UEFI system, you wouldn’t need to care about a boot manager much, GRUB in this case, you can use your BIOS boot menu to choose which drive to boot to. Each OS creates its own entry there. You can check or edit the entries with efibootmgr from inside a Linux terminal. Depending on what you need to dual boot to and on your machine specs, maybe virtualization would be better.
NVIDIA is simple to install from RPMFusion repositories. On F31’s Gnome you also need GNOME Run With PRIME extension to help you run games or other software with the discrete GPU (some games I have to use it). Installing nvidia-settings and GreenWithEnvy (GWE) is helpful to monitor your GPU.
I currently do not use PRIME, as I use my laptop as a desktop at home, but it seems to have improved. I will take a look.