I may be in the minority here but I think Devastator looks awful, What the hell is that thing for a head!?
As far as The Fallen, it looks totally out of place with what we've seen in the movies so far, the Fallen looks like an H.R. Giger creation....which would make it the coolest transformer of the whole lot! And what does the Fallen transform into an oral B toothbrush?!
Images courtesy of http://www.actoys.net/
The REAL Devastator!