I have had both and I like the iphone better. I just got mine and am still learning new things with it. Wasn't sure about the touch screen but after having it for a month I like it. It is user friendly and you can do talk and surf at the same time. Only dowfall is the battery life, the blackberry would last a couple days and iphone is good for about a day only with moderate use.
I have the iPhone, I don't like the blackberries quite as much. My next phone will probably be an android of sorts... or the new palm