iPhone vs. BlackBerry? Which is a better phone?

[hmm]

I've had my iPhone 3gs for almost a year now and don't get me wrong it has done me very well..but everyone has blackberrys now, and they're all BBMing and I kinda feel like i'm out of the loop..the one thing i love is that with an iphone its just like having a little computer with you everywhere..idk should i switch to blackberry?:/