Remember to use DVD+R media, not DVD-R.

Why? What´s the performance difference?

Hernan, there is no difference in performance, at least if you mean picture quality. All you have on a DVD is 1s and 0s and they don't care if they are written on +R or -R.

In this topic's context Bart's comment means "remember to use +Rs when trying to create bit-setting enabled DVD+Rs". Bit-setting does not work with DVD-Rs.