DVD-R is best suited for playback in most all DVD players. The first generation players may have trouble reading them, but about 95% of the players out there will play them. DVD+R don’t playback in machines unless the player states it plays DVD+R. I don’t use DVD+R, I think their best suited for storing files on for your computer.
If the DVD-R you are using skips or jumps, try taking it out and putting it back in again, sometimes the reader may weird out on the disc. If it happens again, then you might have bad disc.