I am familiar with the group due to their affiliation with the music video game Rock Band 4 which included their song "Afterlife".
I've been listening to them since 2009 (I think) and have 4 different shirts of theirs. I love all their albums but I would say the self-titled album is my favorite, followed by a tie for 2nd with City of Evil and Nightmare. My absolute favorite songs are Dear God (which is ironically the least Avenged Sevenfold-esque song haha), Brompton Cocktail, Nightmare, Fiction, Victim, I Won't See You Tonight pt. 1, A Little Piece of Heaven, and all their hits. My favorite song from The Stage is Exist. I love the way they tell the story with the music I forgot about Chapter Four, that's also up there with my favorites