I like to advise my clients that they use "brand name DVD's" and refrain from so-called bulk bundles. In general, those bulk purchases do OK, but if you plan to really store the media, the cost is minor difference. Day-to-day use as in repeated usage could best explain using better DVDs as well. The idea is that less than capable discs tend to become unreliable over time either from handling or improper storage. I rarely find bad discs but those found usually came from bulk bundles from some unknown XYZ label and degrade quickly.
HP and Philips were the major leaders in disc use prior to the home front and generally rely on DVD+R for best overall use because it simply falls into all the needs a DVD drives may better support. Next, a brand name does make a difference as in the longevity of the dies used to make them are more crisp and dramatic pressing as well material make-up. Basically, it boils down that cheap is cheap. Die use(pressing) is considerably less per die and then that die maybe sold to other disc makers that use that die until its useless, which may also suggest discs made from such dies aren't as pristine as can be generating flaws.
My favorites are Philips, Toshiba, Sony and TDK, possibility Kodak too. However, some manufacturers maybe supplying the same discs to various labels, so stick with one that seems to work well with your setup.