That thread is 3 years old and I could say they have all changed since then. I do no suggest reading that thread as it contains a lot of incorrect info.
Dvi and hdmi are both digital but they are not the same signal. Not that it matters as they should be the same quality. Hdmi signal also carries audio. There is no such thing as better quality cables for dvi or hdmi. Do not waste money on gold plated cables that claim they have better quality video.
Vga is analog and is more susceptible to interference and degradation over the cable so isn't recommended. You most likely won't see a difference, but why take the chance.
If you want more in depth info, you could just read the wiki pages.http://en.wikipedia.org/wiki/Video_Graphics_Arrayhttp://en.wikipedia.org/wiki/Digital_Visual_Interfacehttp://en.wikipedia.org/wiki/HDMI