Kirsten Dunst, mostly because of her cooler, calmer demeanor.
I'd say it's subjective, though, because my main reason for not preferring Reese Witherspoon is because she reminds me too much of my own intensity and lack of calmness (much more obvious in person, trust me). In other words, she reminds me of my flaws.
I guess Kirsten Dunst. She seems a little more complex. I think I've liked more movies with her, although Reese Witherspoon was good in Election. They both are pretty plain & nothing special looks-wise.
"Charlotte sometimes dreams a wall around herself. But it's always with love - So much love it looks like everything else. Charlotte Sometimes - So far away, glass sealed and pretty." - The Cure