Well, you're about to enter a new world: the one of KDVD. That means 6 hours of DVD quality on one disc. So drop the VCD on a DVD, execpt if you really want to cram 14 hours on one disc.
It doesn't really matter which type of media you use. I always use +R media, as it is possible with these media to forsee in errorcorrection while burning.
The -R media hasn't. So I would recommend the +R media. But, before you buy lots of em, make sure your SAP plays it correctly, as not every SAP plays both formats.
Hope this helps you out.