Which DVD disc to use? +/-?

What kind of discs should I use to backup my DVD movies?

DVD+R or DVD-R?

I was trying to burn one movie (using DVD shrink) and it said it required DVD-R and not DVD+R that I was using.

Is it better to use DVD-R discs?

Maybe this link is helpful:
http://club.cdfreaks.com/showthread.php?t=71192&highlight=DVD-+DVD

Maybe you sure first ask what burner model and firmware do you have??? Then what kinda media are you using? Some players need -ROM burned media to work and some will work with -R media burns. That sounds like a false statement you can burn to -R or +R - it’s when you have to booktype to play on standalone that you will need to burn to +R media but then to have the drive or software prior to the burn convert the format burn from DVD+R to DVD-ROM to improve compatiblity on standalone.