DVD+9R vs. DVD-9R

I understand that most DVD-5R discs are most compatible with players than the DVD+5R disks. However, I am unaware as to whether there will be a DVD-9R disk or burner? As of now all I can find in the field of DVD Burners is +9R burners. Can anyone enlighten me on the field of burners and whether their will be a -9R burner anytime soon that will be more compatible with dvd players than the +9R disks? Any information would be appreciated. Thanks.