I find that blank DVDs are more delicate than CDs and much more sensitive to brand/quality difference. You have to mistreat a CD pretty badly to render it unreadable in a computer (smudges are worse than most scratches) whereas it's quite common for lousy quality DVDs to throw read errors at you even immediately after being burned (happened to me with these dodgy Ul Tran dvds).
DVD media is my primary form of backup. If you're worried about their quality, buy some Verbatims (or something of that standard) and burn your critical data twice for redundancy.
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