1. Answer: It depends on everyone's taste and these rankings change all the time. According to RankMyPorn, at the moment, the top ranked Brunettes Female Pornstars in the world are: Lana Rhoades, Riley Reid, Little Caprice, Gabbie Carter, Autumn Falls, Eva Angelina, Tori Black, Kagney Linn Karter, Liya Silver, Janice Griffith, 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.