We virtually scarcely knows anything about Qu, and author even confirmed that they are meant to be plot device rather than actual character(s)

So it between AM and Judge. I, personally, opt Judge

I know that I'll get hate for this, but I think that Judge Holden shouldn't be known as the guy who is in the most Evil Trio, especially since he's just a representation of an Evil Corrupt Politician/Civil Servant, that is a murderer and a Kid Toucher. I've read The Blood Meridian, and his character mostly revolves around shock value, and gruesome descriptions of his actions. It's my opinion, if you disagree, then just tell me what you think.