1. Answer: It depends on everyone's taste and these rankings change all the time. According to RankMyPorn, at the moment, the top ranked Caucasians Female Pornstars in the world are: August Ames, Veronica Leal, Autumn Falls, Lana Rhoades, Katie Morgan, Monique Alexander, Little Caprice, Mia Malkova, Alina Lopez, Gabbie Carter, but these will change based on what people vote.
2. Answer: It changes. You can see the latest rankings on RankMyPorn.com and also vote on it for free.