With my stand-alone Panasonic, Magnavox, Philips, and other DVD recorders I prefer JVC/Taiyo Yuden 8x Premium Line DVD-R media for master recordings and archival recordings. Vertbatim DataLifePlus 8x DVD-R media is also suitable for such work.
For use with duplicators and computers I use 16x Verbatim AZO series or JVC/Taiyo Yuden 16x media for distribution of material with a normal lifespan expectation.
For short-interest duplicated material I sometimes use the throw-away China Magnetics Corporation (CMC) media, Verbatim Life Series, Magnavox, TDK, HP, Philips and/or other brands that are often found on sale for $12.99 per spindle of 100 DVDs. Even though that CMC media is the same as Memorex, I refuse to use media bearing the Memorex brand name. The other brands do not have such a bad reputation, e.g., TDK used to be among the best retail brands but not since TDK became part of Imation Corporation:
Pictured below are some examples, the throw-away grade China Magnetics Corporation Verbatim Life Series at the left, the good Mitsubishi Chemical Corporation Verbatim AZO series at the center and the outstanding JVC/Taiyo Yuden Premium Line media at the right.