Aw c'mon, that's like asking Bill Gates why Windows is better than Linux, plus it's very old (an advantage of dvd+ being 2.4x speed vs. dvd-'s 1.x?). Most of the other "arguments" refer to compatibility, and if I remember correctly I read that dvd-r has a slight edge on compatibility on set top players, it was like 89% vs 85%, sorry I can't provide a link, I'm not sure where I read it. In any case, at this point there's really no difference 'tween - and +, I think dvd- media is cheaper, but I could be wrong.