Kate thinks with her heart and Juliet thinks with her brain. I think thats the difference. They are kind of like a yin and yang together. You have the wild/emotional/aggressive side which is kate, but she needs to have some guidance and common sense with some aspects. And then you have Juliet, who is very intelligent and aware of things around her, but she seems to lack the ability to sympathize with emotions and get in touch with the inner-juliet. Now think about what a great combination these two gals make huh? Perhaps thats why jack is attracted to both, for diff. reasons

__________________
Because all we really need to survive is one person who truly loves us. And you have her.