See, I don't think War Pigs is such an amazing cover. Sure, they play it perfectly. But aside from Patton's obviously different vocals, it just sounds like a really good tribute band did the cover. It's too note-for-note perfect. I am not a fan of Black Sabbath, but if I was, that cover would give me absolutely no reason to listen to the cover. Since I am not a Black Sabbath fan, however, I prefer the FNM version since Patton has a better singing voice and the production is a little cleaner on it.