The SMBCD emulator support sheet has been updated to include more information and more tested emulators! You can see the updated list here: famicomcd.github.io/smbcd/emulat... Of course, as we find and test more SNES emulators, we will update the list accordingly!

It says that RetroArch can only be used with the BSNES to play. I found this to be inaccurate as I can run the demo with the snes9x, including MSU-1, without issues.