For DVD+R I use Verbatim, Sony, and TDK (in order of preference).
For Dual Layer (DL) DVD+R I use Verbatim (2.4x speed) exclusively and I only buy the ones made in Singapore. I used to order these online (Newegg), but I got two 20 Disc cakes made in India. I never had a failed burn until I tried a Verbatim DL DVD from India. I buy these in Best Buy when they are on sale for $30 (like this week) for a cake of 20 Discs so that I can check for myself that the Discs were indeed manufactured in Singapore.
While the Verbatim DL DVD+R 2.4x can be burned at up to 8x speed, if you want a standalone DVD player to read the disk, I highly recommend just burning at the rated speed of 2.4x. I burned a couple of these DVDs at 4x and 6x speeds and while my HTPC never had a problem playing back the video, my Sony DVD player did have problems.