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, Pepper Hart, Lenina Crowne, Tana Lea, Madison Ivy, Purple Bitch, Faye Reagan, Ivy Secret, Ella Hughes, Jennifer White, 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.