Whats the best dvd-r disc to use for backups

ive used 2 types of dvd-r blank media and one dvd-r never works while the other one works just fine.
the one that works are 4x 4.7gb gigatain and the ones that dont are mitsubishi 4.7gb dvd-r

does it realy matter what dvd-r you use?

please post in.

i use the datawrite titanium dvd-r @ the slowest speed and i have NOT had a problem with 1 yet

movies or games

fanx for that ill try them

and also does anyone no where to get cheap discs (that work good)