DVD-RW
On the one hand, we have the forerunner Pioneer, who, in accordance with DVD Forum (the entity which controls the DVD name and technical aspects), developed the DVD-RW.
DVD+RW
On the other hand, there is DVD+RW Alliance, where, among others, we find HP, Philips, Ricoh, Sony, Thomson and Yamaha. They officially claim to have developed a new format because the DVD-RW cannot handle video recording very easily. But it may be that they just don't want to pay royalties to DVD Forum.
The Differences
There is very little difference between DVD-R and DVD+R, both of which can only be written once. They are used in exactly the same way. But you have to be careful with DVD-R because there are two standards for blank disks. The one to use is marked "DVD-R for General Use." The other is marked "DVD-R for Authoring," and it only works for mastering DVD video or data because its composition is different. This sort of DVD-R is not usually available to the general public.
Things get a bit more complicated with DVD-RW and DVD+RW. DVD-RW technology is very similar to that of the CD-RW. For DVD+RW, the Alliance wanted to make video recording easier, especially for home use. So they implemented a technology called Lossless Linking. In DVD+RW video format, a video can be encoded in VBR (variable bit rate). The process of writing at a constant rate takes up a lot of room, so it has to be stopped and started again. This is likely to cause link loss, which makes the disk incompatible with read-only devices like DVD video players. With DVD+RW, the process can be stopped and started again without any link loss. This characteristic makes the format efficient and suitable for random data writing and video applications. With lossless linking, it is also possible to replace any individual block of 32 KB (write unit) with another, without losing compatibility.
For a lossless link, each block of data must be written in the right place with precision (on 1 micron). For this, the groove is controlled by a high-frequency wobble (817 kHz at n=1) to ensure that writing stops and starts in an exact position. The writing clock resulting from the groove is very precise. At the same time, addressing information is stored in the spiral groove by locally inverting the radial wobble mark. There are four addresses per ECC block of 32 KB, so the address format is reliable with wide margins of detection.
Conclusion
You will notice that all the burners in the tests are pretty much equal. Though some models did better in some tests, the differences are minimal for both read and write. We can't even distinguish by price, since the recommended price for each of them is around $300. But we can differentiate two categories of use.
LET OP:
Archiving 
If your main goal is to archive data, the DVD-R format (Pioneer DVR-A05 or TEAC DV-W50E) is the best choice. 4x burn speed gives you your result in 15 minutes. The time saved compared to DVD+R at 2.4x (over 24 minutes) is not to be sneezed at.
Video
However, if you are more interested in video, the DVD+RW format is still the best solution. It is much more flexible to use and, what's more, it is compatible with Philips home players.
Compatibility
In the end, apart from certain technical differences between the two formats which prevent you from using a DVD+RW disk on a DVD-RW burner and vice versa, the final recorded disk (DVD-RW or DVD+RW) is read-compatible with DVD-ROM drives, home players and even DVD-RW or DVD+RW burners. Most of the branded home DVD players released within the last two months are not just DVD-RW- or DVD+RW-compatible, they are also DVD-R- and DVD+R-compatible. For older players, the compatibility rate is 80%.
Blank Disks
Never has the quality of blank disks been more important. No-name disks from Asia may cut prices, but above all, they cut quality. DVD recording absolutely must be done on good quality disks, and this means branded ones.
BRON: Toms Harde Waren 
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