Sirnice
The advantage of the DVD- drives is that the media is currently cheaper than the media for the DVD- drives, but that not a big advantage unless you are going to burn lots of discs every month.
The advantage of the DVD + drives are :
...you have the unique advantage of lossless linking, allowing you to replace parts of a disc without the need of rewriting the entire contents
...you can use the DVD-Video compatible DVD+VR format, allowing you to make changes directly on the recorded disc
...you have the advantage of defect-management during writing, for a more robust performance and less writing errors
...you are better protected against shocks during writing, since the exact location can be found even during recording
...you can immediately start recording to a disc, as formatting takes place in the background
...you can optionally use all the benefits of Mount Rainier (EasyWrite) drag-'n-drop support
...you can optionally write discs in CAV mode, enabling for much higher performance in data applications
Compatibility with DVD-ROM drives and DVD-Video players
Direct On-disc editing of video recordings using suitbale software, no need to transfer to harddrive first
No manual formatting or finalization required for DVD+RW discs
Full random access support for powerful data storage applications
4x DVD+RW is the fastest rewritable technology around
One disc for video/data
Fully supported by Microsoft - Mt. Rainier capable
no wonder you couldn't find it. 
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