1. Answer: It depends on everyone's taste and these rankings change all the time. According to RankMyPorn, at the moment, the top ranked Ebony Male Pornstars in the world are: Troy Francisco, Jax Slayher, Rico Strong, Stallion, Darrell Deeps, Tyler Knight, Pressure, Flash Brown, Isiah Maxwell, Rob Piper, 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.