if you're talking about the video quality, vanilla sbs (which is seoul i think) should be a tad better. gbc/jtv/etc are regional or private broadcasters or something and they use lower bitrates or a degraded stream.Terrible video of the Inkigayo T ara performance makes it tough to make gifs that don't look bad :/
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speaking of which, i got a ~10mbit h.264 1080i ts music core episode once, and it often had obviously more detail than the regular mpeg2 ts. it was from some cable network, can't remember the name. would kill for more stuff from that network >:O