Stay away from brand names which start with data, ri (ricoh is excluded), tuff, bulk and the like. Also, if the brand sounds like some kind of chinese restaurant name or medicinal company (e.g. Golden Monkey Industries or something), say "no!".
I also avoid brand names which make it sound like they are trying too hard to tell you how good they are. For example, brand names that start with A1, Super (Verbatim's Super AZO is excluded), Ultra, Maxi, Power, Laser, Magic etc. It's an advertising trick that backfires - trying to create customer confidence by building a brand name that makes the product sound credible. The problem is that the companies that really make decent quality discs do not need to resort to such "branding" tricks because their brand names are known by reputation for quality.