Everyone's tastes in bbj are a lil different hence the differences in opinion.
I would consider Amanda's Bbj to be a sensual, slow one. My favorite kind. Hence her high place on my top ever list.
If you are into gagging, more dom-sub bbj, that's not her bag so she might be lower for you. Or if you prefer a more aggressive one.
Etc.
I consider Amanda and BB (and to an extent the killer Dees) to be the best at the leisurely paced bbj.