I dont see a world of difference in smoothness. They run equally as well. Considering how much more Maemo 6 is doing, I'd pick the N9 any day. I hate all of the use of back buttons used in WP7. I got lost easily trying to create an Xbox avatar, ended up losing my changes. Then there's the times I want to go back and then crap! There goes the web page I was just looking at because I hit the browser back instead of the system back. I dumped my lumia back to the wife too, they're going to have a huge female userbase. On the plus side, the N900 is back in my hands