Difference between DVD-R/+R?

May i know the difference between the 2 formats? How are they applicable in using a DVD writer to burn information from your hdd?

http://club.cdfreaks.com/showthread.php?t=103718

There are lots of minor differences, but if you want to know the applicable ones:
DVD-R records your burner’s model, and possibly the serial number and firmware. It has a size of 4489 MB.
DVD+R has a size of 4482 MB, but can be bitset.

And if both are burnt with high quality, it’s hard to say one is better/more compatible than the other.