Instead of managing a folder filled with a .cue file and dozens of .bin audio tracks, you get one single .chd file per game.
To understand the supremacy of CHD, you have to understand the mess it replaced. The Sega Saturn utilized a unique double-density CD-ROM structure. Unlike standard data CDs, Saturn discs often interleaved audio tracks and data tracks in a way that early PC CD-ROM drives struggled to read. sega saturn roms chd