Besides the Plus and Minus, there was DVD-RAM. But that has pretty much vanished except Panasonic still wants to use DVD-RAM.
It's a format of the media and at the end of the day, I can't see any advantage from one over the other. All that I know is that if you have a DVD+RW recorder, then you get Plus media. If you get some DVD+/-RW recorder, then you can get what words best in your other DVD units.
NO ONE has a database of DVD players that will tell you which works best with what type.
Bob
I see advertisements for DVD+R's and DVD-R's. Same with CD's. What do the plus and minus signify?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic