I think it was made to serve the less experienced person who just wants good sounding drums out of the box. It is both easier to use and cheaper to buy than Superior. I have both, but most of the time reach for EZdrummer because it sounds good to me, uses fewer computer resources and has hundreds of sounds to choose from (if you have a few expansions).
If you are playing at home using v-drums to trigger a VST, I don't really see the point in a fully editable product like Superior. Superior is more for people recording, who need to find that perfect sound for their project.