Yea, I'm still debating, lol. I hear pros and cons of both, and I'm still debating going with a full 7" touch screen or not. Also, someone mentioned in a review that the Sony/TomTom nav doesn't give you relative direction when viewing POIs. So in other words you can't tell if something is 5 miles ahead of you or behind you. Still need to look into that, but that would be really annoying.
I'd be nearly sold on the Pioneer 7" if it wasn't for the bottom lip, I'm just not sure if I dig it.