Seriously. DVD-RW 4.7GB has about six times more capacity than 700MB CD-RW. There are 24x CD-RW and 12/10/8x CD-RW (disregarding anything slower) compared to 1x DVD-RW (2x DVD-RW will be available beginning from Q1 2003) while 1x DVD is about the speed of 10x CD. Some people are happy with Princo CD-RW while some others think they are worth nothing and better not use them even if they are given for free. I have seen very few people who actually use a large number of DVD-RW media and none who praises it.
So if 1. you can buy Princo 10x CD-RW 700MB media for $0.5 each and Princo 1x DVD-RW 4.7GB media for the same price, 2. you already have an optical storage drive that can write to CD-RW and DVD-RW media, and 3. you need some rewritable media to add data into discs already written or replace some part of them and experiment with some ISO images, VCD, DVD-Video, CD Audio, DVD Audio, and so on, which would you choose to buy?