The iphone is without doubt the best phone around, but it's also more expensive. Just depends what priorities you have and what you want really.

Quite a few people I know have Blackberrys, so Blackberry Messenger(an instant messaging app that's always on) was something I wanted. That and the fact I didn't want to spend the cash on an iphone made me decide on the BB.

Your decision at the end of the day... they are both good phones.