Nicki Minaj.
Others have already said it, but Nicki has done so much more in a year and a half than Kim did with her whole career. Everyone wants Nicki on their songs and on their tours. She has collabs with the biggest names in pop and hip-hop. A nail-polish line and a Barbie doll. She's an enormous crossover artist. Has an album that CLIMBED to number one and will soon be double platinum. And 2012 will only make her bigger, I mean, a super bowl performance with Madonna!?
Kim had her time and racked up a few accomplishments, but the way she's acting now, she may as well just "hang it up, flatscreen." The only thing anchoring her to relevancy, ironically, is Nicki Minaj. If Kim wasn't dissing Nicki, no one would even notice her.

Kim. She's already buried and just hasn't realized it yet.