The Kingston Hypermedia and Imation CDs are both made by CMC Magnetics (as was posted by Hgabriel). Thus, the dye used in the CDs are exactly the same (as long as you're comparing the same speed CDs. 8X CDs use a different dye than 12X CDs). Personally, I have never seen a difference between the two brands of CDs, those claiming they have had different experiences with both CDs may just be using two different "speeds" of CDs.
I have also used both for audio, and data, and have never had any problems (no audio degradation or anything to that effect). I haven't tried using it for video yet, so I don't know how well it performs.
Great price for the CDs though, I'm gonna run out and grab a few spindles for myself.