If you had asked this question a few years ago I might have said Kim because while I have always liked & admired Gisele, those swarthy ladies have always been my type.
But as the years have passed, Gisele has become more beautiful, has entered into a stable marriage and has become a successful businesswoman. On the other hand, Kim Kartrashcan has become more like a character in a Tex Avery cartoon, unreal, ridiculous. And like the first respondent said, Kim's a whore.
Gisele has two beautiful children, didn't give them stunt names and she doesn't use them as props in a television show. Kim's child and the one on the way are there to be story lines in KUWTK much like the Wookie's fertility issues and Kendall's D-Cups (next season).
It's not even close: Gisele.