I've met both of them (though Danica was closer to 21 when I met her) and I find Milka to be much better looking - unless one likes girls with a more boyish shape. And especially if you have a kid with you, Milka is a super sweetheart. She's not a very good driver, but she's as sweet as she can be. Milka is, IMO, the easier one to get to know. Too bad she's very, very married.
I don't know her personally, but Danica does have a reputation as an egotistical little asshole. She's 27+ years old and she's won only one professional level auto race
in her entire life. And yet she talks about going straight into Formula One or NASCAR?
She races in the IRL. That's a formula about even with GP2 in terms of performance. Most of the drivers who make it to F1 win or place highly in the GP2 championship within two years. Danica's been in the IRL for almost five seasons and she's won one race. IMO, the problem with her is that she believes her own hype.
There are several good looking women racers now: Ashley Force, Angelle Sampey, Milka Duno, et al. Milka has won a race, Ashley Force has won multiple races and Angelle Sampey has won multiple championships.
Personally, I hope that Danica does go to NASCAR. And I hope she goes to a team that isn't loaded with provisionals. I expect she'll be able to do lots of bikini shoots... since she won't be racing most weekends (that she doesn't qualify for the race). The IRL is the only place that Danica is special. She probably needs to stick with a series, like the IRL, that's pretty desperate right now and hanging onto life by a thread.