Man, it's nice to see a thread which actually discusses the music for a change. This is one of the better threads in a while. Props to the mods for not locking it since, of course, this has been discussed a million times before. Indeed, being able to thoughtfully answer, "Which do you prefer, Origin or Fallen?" is the litmus test for a true Ev fan.
My 2 cents:
If I could choose only one of the two Evanescence albums, I would pick
Origin. As has been said, the variety of styles showcased by the album are second to none. It goes all over the techno-metal landscape. On
Origin you get a contrast between, say, the hardest Ev song ('Lies') and the softest ('Anywhere' -- the sort of song you will never hear again on an Ev record.) And you get everything in between, in varying layers of electronica, straight metal, and (best of all, from a eclectic standpoint)
worship music. How wild is that? And you get the highest reaches of art metal (I contend that 'Even in Death' is Evanescence's masterpeice).
It's all wrapped up in the freshest-sounding, brilliantly produced authentic package. At every second of
Origin's playtime, you can't escape how
real this feels, no matter how unfathomable the genius of the work is. It's that excitement that made me an Evanescence fan, listening to
Origin as I write this gives me goosebumps from just the energy of the record.
Fallen is another story. I certainly like
Fallen, but the production is too slick to be my favorite. But I'm glad it has a distinctive sound. I hope all of Ev's records sound radically different (Alas, I don't think Amy is up to that task in the same way that Ben and Amy would have been.

)
Fallen is almost a concept album, the score to some great, unmade film. It certainly succedes in setting a consistent tone and color for the album as a whole, what with the glossy feeling the whole thing has. But while it sounds like
Fallen is a consistent piece, the songs are too disconected -- there's no overall narrative, there's very little thought to the pacing of storytelling. So there's a constant tension with
Fallen, a battle between the Unifying Concept and the Directionless Same-ness if you will. It's not as knock-out brilliant as
Origin, but it's at least trying something.