DVD - RW and DVD + RW

I just finished reading an article on what the difference between the two are and I know as much as when I started, very little. I just looked on my desk and I have both of them. Not sure why I chose one over the other. I understand about the RW, but why would one buy a plus and why would one buy a minus? I don't believe there are separate DVD drives for either format, so why are there two? == It seems like that someone told me that one can be used on a regular DVD player and one can only be used on a PC. Is that correct? Fill me in. Thanks,

I believe the + is compatible with all DVD players. This site has a simple explanation.

DVD+R and DVD-R: A Beginners Explanation

A Guy

It took me a lot of reading, but for those who choose not to read, this is the condensed version.
As of June 2006, there is no physical difference between a DVD-R/-RW disc and a DVD+R/+RW disc.

The discs yes. There is some differences in formats, and there are burners that are just one or the other. Or, at least there used to be :)

A Guy

There is only one difference that I know of. For making "backup" copies of playstation 2 games, the -R works better as the +R's will cause skipping with cut scene playback. I also thought -R's have better compatibility with drives, but that is something I am not sure about.