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DVD Dual means that the drive can burn both media types (both + and - media). Some drives only burn 1 type. DVD Super Multi is a drive that will support DVD -, + and RAM media. Personally, I think compatibility is better for the - media since more players support this media type (out before + media and more standardized vs RAM media).
Note that DVD-R (say: DVD minus R) and DVD+R (say: DVD plus R) is a different kind of disc. There is virtually no difference between those types, but it might be the case that your DVD burning device can only burn DVD-R or only burn DVD+R.