According to the video, he measured better contrast on the white model. I suspect the black border might create an optical illusion that's interpreted as better contrast, which is why some users might think that the black model has deeper blacks.
I'm not sure his method produces good results, but I haven't seen any better comparison either.
My Go 7 has slightly less sharp text and worse contrast than my Libra 2. It hasn't yellowed yet, but it's too early to tell. I had a white Leaf 2, which had the sharpest screen I've seen on a modern e-reader, but unfortunately it did turn yellow around the edges like your black version.
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