Red lentils have a "softer" taste than ordinary lentils and are prepared much faster (it only takes 15 minutes). It is rich in protein and fiber. Also, due to its low content of insoluble (hard) fiber, it is more digestible, especially for people with irritable bowel.
If you cook it well, it is ideal for making it puree. You can also make it as a soup, following the same recipe as the classic lentils, or make wonderful exotic salads with it.