Puggo - Jar Jar's Yoda said:
From what I've read lately on the various innernets, for SL Taiyo Yuden is the way to go, but they aren't as reliable for DL.
Tayo Yuden does not even make DVD+R DL's, I have read that they did/do make DVD-R DL's though, but I don't use those, only +R's.