Thanks, smokyrain. I'll probably switch over to DVD-R when this pack is finished. Although DVD+R work fine for me. And I knew about setting the Booktype to DVD-ROM. Thanks again for your help, it's appreciated.
To answer the question "no" neither is better than the other if that's what you want to know,why then is one + & the other -,differing format type,in the early days - media was more common & compatible with dvd players,that's pretty much it,if you like using + media there's no need to change,for the record yep i use + as well