I would like to know which image to use for the Solitude AML-S905D3-CC board, because when I go into the downloads, several boards appear except this one. I bought the card 6 months ago and I still haven’t been able to use it due to the lack of an image, I wanted a Lakka or even a batocera that was compatible.
It looks like these are both external projects that create device-specific images. Neither appear to have specific support for the 905D3. 
Perhaps you could try the image for Potato or Frite that they do have? I don’t know if there’s anything about the Solitude that differs enough from the other 905 devices to actively break those images.
Solitude runs the UEFI +arm64 images per the download page. Board specific images are only for legacy boards without onboard bootloader. For third party projects, you have to contact the projects themselves for support.