the new dual layer recordable dvd's are only in +r format, and I think maybe you can only find 8x/12x dvd's in +R format too. My personal preference is -R because it tends to work better in older home dvd players when you make/copy movies. I don't mind using only 4x or 6x
both played movies but they were imcompatable with each other.
the electronic people made them agree on one format (that why DVD got realease 2 years late) so we would have another vhs vs beta war. toshiba won
al least they will play on the same dvd players for the most part