I'd say Nikki, but only by the size of her milk makers. Kari has a MUCH more attractive belly and ass. Nikki's face is cuter and her b00bs....well those speak for themselves.
enough about who is better..lol
here is a link of what nextdoor nikki thinks of Kari Sweets butt plus some pics of Kari ...check out nikki's comments about 6 or so posts from the top!!
EDIT