I disagree with the idea that Judge is a bad manga, and I think the plot is very different from Doubt, I've only read volume one of Judge but I finished Doubt and can tell a huge difference, Judge is much more of a "formal" killing, it's more intellectual, it's more based on reason (as reasonable as serial killers can get) where as Doubt is far more sparratic, there's no time line, there's no telling the victums why they're there or mapping out who to kill first and why, it was just trapping rats in a box and bumping them off one by one, where as Judge is much more about systematic killing, making people realize why they're there and instilling that kind of fear in them
As for Yukiko-Chan mentioning one guy was there because he was gay, I'd like to correct that, Judge hasn't been completely translated yet, we don't know that's why, he said HE thinks that's why but that doesn't mean it is, if you look at movies like Nine Dead and the SAW series people often make mistakes about why they're being judged and what their "sins" are, if you look at the doodles on the spare pages in Judge, you'll see that there's an animal symbol for each of the sins, for example, the chibi lion has "pride" written next to it, if we remember that Kazu wore what looked like a wolf head and the wolf had "greed" written next to it, we can determine that perhaps the reason he's there is not because of his sexuality, but because he said "I grew up in a well off family but was never truly happy", it may have to do with his family's money, as we found in Doubt the background stories aren't always revealed right away, for all we know, he did something that has to do with his family's money that DOES constitute a serious sin, he could have kidnapped or murdered someone for money because he was kicked out, but he isn't confessing to it, I say before we make any blanket statements we wait for the entire thing