1. Answer: It depends on everyone's taste and these rankings change all the time. According to RankMyPorn, at the moment, the top ranked Red Hair Female Pornstars in the world are: Monique Alexander, Madison Ivy, Faye Reagan, Lenina Crowne, Ivy Secret, Pepper Hart, Tana Lea, Maitland Ward Baxter, Jennifer White, Ella Hughes, 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.