I've sold about as many DVD's as Joe has with about 1250-1500 DVDs a year for 2 years.
Commercially
My experience is DVD-R is friendlier with all dvd players. From my experience these problems with dvd compatiblity are with low end, extremely old, or from non common brandnames. Majority of dvd player from sony, pioneer, etc.. will play both type of disc or atleast one type. I've done test and I'd would go with DVD-R and have dvd+R per request or incompatibility problems.
From a physical understand of DVD+R, they should be better than DVD-r but honestly it's just royalities and marketing dispute between companies. From my understanding dvd+r major improvement is playback with scratched surfaces. Seems more like marketing to me.
As for Ritek media, they have variable grade stuff. A grade stuff, A-/B+ grades, and B graded stuff that they relabel. I never get problems out of A grade Riteks but lower grades you might get a bad disc or more errors but nothing affect playback.
Verbatim is more consistent than Riteks and a safer bet.
Most dvd media is just relabeling from 3-4 manufacturers out there. Ritek's quality is based of the grade they get which u can find based of a prefix coded on serial label
For home use. Like Tong, I went out and testd all my machines to see what and what they don't like. I had only one machine reject DVD+R and it's a cheapo dvd player i gave away. I just use riteks 4x dvd-r's and they get spread out for family use in more dozens of dvd players and I'm yet to get complaints but i will get some random machine rejectn dvd+r
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