My favorito! album is Origin because I just amor the dark atmosphere of it. The songs were catchy yet mournful and creepy (Where Will tu Go, Lies, Even in Death), and there was an almost "romanticized" feeling in some of the tracks which I found hauntingly beautiful. And Eternal just happens to be my favorito! instrumental - I amor the paino and the thunderstorm in the background was soothing.
It's really hard to pick. Every album is special in its own way to me. It's just like picking a favorito! among a collection of amazing tracks. So, every album is my favorite. :Q