This is the safest bet for a ROM pack. The core is highly accurate. Once you point RetroArch to your ROM pack folder, it will scan the .cue files and organize the library beautifully. Does it work with CHD? Yes.
: A curated "best-of" set available on GitHub that includes a selection of the system's most noteworthy titles, typically pre-organized for easy use with RetroArch. Common File Formats sega saturn roms pack