Also, apart from the video being infinitely superior, there's also the superior sound and all the other cool stuff that came with it. Rather than listing it all, I'll just give links to the Kanzentai-articles on the various boxes:
DragonBox
DragonBox Z Volume 1
DragonBox Z Volume 2
DragonBox GT
DragonBox The Movies
In other worRAB, DragonBox = Just about perfect
Season Sets = Worst release of any anime I've ever bought. (I'm not exaggerating.)
The show was made with mono-sound, so no. Even in Japan, the only thing that was in stereo was the 10th anniversary movie.