Lossless audio quality that (practically) never degrades.
You can get digital files of the album when you plug them into a computer.
You get the same tactile experience of putting a disc in a device that spins it up and plays your music.
The way they reflect light is really pretty.
I have a growing CD collection. Sometimes artists neglect releasing on CD because everything is streaming nowadays and most people who buy physical media are infatuated with vinyls. I end up making some of my own when this is the case.