Also, Taiyo Yuden doesn't make DVD+R DL discs. Verbatim supposedly made high quality DVD+R DL discs in Singapore, but a few years ago they moved production to UAE, and the reviews aren't very good for those.
I just got a BD-RE writer in a new laptop, and have no idea what a good brand for BD discs is. I haven't looked into it, as I don't have a need to burn BDs yet.
Happiness is twin floppies.