There is one advantage to CVD vs SVCD and that's compatibility. SVCD uses a resolution incompatible with DVD thus to convert the SVCD to DVD requires re-encoding of the video (and audio). This means quality loss, user error, etc.

With a CVD the video resolution is already compatible with DVD. If the CVD was created with 48K audio (and I did all of mine this way, maybe that's technically an XCVD) an MPG extracted from a CVD can be burned straight to DVD without any re-encoding of video or audio and at a savings of a great amount of time.

CVD has served me very well indeed.