I'm not sure there is a consensus of opinion regarding the DL blu ray media. Normally I recommend Verbatim or SmartBlu for single layer, but I haven't heard any reports of extraordinary results with the Verbatim 50gb disks, and the SmartBlu DL discs are made by CMC, not FTI/Falcon, so they are probably not much better than any of the other Taiwanese made media.
For a while there were good user reviews coming in for the Japanese made DL blu ray sold under the Sony, TDK and Panasonic brands. Extremely expensive though, and the cheaper discs out of Taiwan have pushed them out of the market for the most part. Most of the DL media sold under the Sony, TDK and Panasonic brands are now made in Taiwan or even China.
Nikoneko Ya (a Japanese online shop) still sells Panasonic DL discs made in Japan, but the shipping costs make this very expensive for US buyers.