it's like video recorders back in the olde days... VHS, Betamax, Video2000... all recorders, all different formats.
DVD's are a bit less dramatic. First we had DVDs, then DVD-Rs, then DVD+Rs with some technical innovations. Today, most DVD players will read both formats, but this depends on the brand, and whether they actively support one of the two sides.
I'd say that DVD+Rs are better, because they burn faster and have build-in "seamless link". DVD+Rs do not have to be more expensive; that depends on the brand, and even the country (variable extra taxes).
Generally speaking, if you have a newish DVD player (<2 years), you'd be safe to go for either a + burner, a - burner, or a +/- burner. The price difference is pretty slim these days.
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