What are the pro and cons of having an iphone and a blackberry Bold 9900?

[ZaC]

I am deciding which phone to get - either an iphone or a blackberry - and since I'm upgrading from a dumb phone I don't have any preference. Many Blackberry users that I talk to that have the bold 9900 dislike it. What are the benefits of having one over another? BBM vs. iMessage etc. Hardware vs. Software


Is it worth it to have an ipod touch (like i have) and have a blackberry? Or just buy an iphone?

If so a Blackberry could you explain or point me in the direction of a website so I can properly understand Blackberries?

Thanks

P.S. I'm in Australia