When composing different types of media, such as CDs and DVDs, Revisor composes these discs in one run, making the different media completely consistent. pungi would require you to run twice, once for CDs, and once for DVDs. This is because pungi uses the part / <size> kickstart configuration directive to set the maximum size of the media, and has no option to override the size on the command-line, nor to compose a certain set of media (it all depends on the size).