1. Answer: It depends on everyone's taste and these rankings change all the time. According to RankMyPorn, at the moment, the top ranked Who Cares Female Pornstars in the world are: Darla Crane, Tiffany Mynx, Julia Ann, Gabby Quinteros, Reagan Foxx, Sara Jay, Nina Hartley, Sally D'Angelo, Erica Lauren, Mellanie Monroe, 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.