what type of media to use?

[mpro]

I am new to this DVD making world...and I think I will love it

Here's my simple question. I've read a lot about the differences between DVD-R and DVD+R but could not find a simple question answered.

Are there any reasons why I should use one media or the other for certain types of activity?

i.e. 1) should I get only one type of media and do all with it or
2) should I get the 2 types and decide which media I use depending one what I am doing.

Thanks in advance...