DMoz is considered as the best as many new upcoming web directories copy/buy link database from them. There fore if your site is in DMoz then it may automatically get added to many new directories on the internet. But at the same time its very hard to get our site up in the directory. Even if all the rules of submission are followed properly, a site can take even to months or year to get added in DMoz.
Yes - in order to get my site listed on there I had to become an editor! The main issue is that they are desparetely short of editors to do the work