DVD Burner

Hello, have had Dell computers in the past and sometimes have had problem with DVD drive. Thinking of getting a new one and some options are DVD-ROM or DVD+/-RW, what is the difference. I want to be able to put a DVD in computer and watch one that I have made, and also burn a CD or DVD of pictures or video. Which should I be getting. Have a small accounting business so need it for some clients that send there info cover on CD still because they haven't got the hang of USB backup yet.