I'm getting a new phone and have been comparing two: the LG Ally and the LG Fathom. They're pretty similar, except that one (the Ally) runs on Android, while the other (the Fathom) runs on Windows Mobile 6.5. I've never had a smartphone and thus have never had experience with either of these operating systems, so I was wondering what the general opinion was of which is better. Any help from someone who has used both?

(Also, any shoutouts from people who have liked/disliked either of these specific phones would help a lot too!)