New & Which One?

First off, this is my first post...new to all the smart phones, been using a regular old cell phone, make a call-hang up.....
So, I'm looking into getting a smart phone of some type, have used a PDA in the past, also had a Garmin IQue 3600 ( GPS and PDA in one)....
What I guess I'm asking is for some insight to the Blackberry vs IPhone issue.
I'm not going to use it for business, personal use only...personal emails, web surfing and of course phone calls (doh). I'm not a youngster so impressing my friends is a non-issue too.
I want the phone to consolidate some devises and hook up to my Zumo 550 GPS on motorcycle with bluetooth function. I know nothing about the Blackberry other than it's one of if not the best devices out there....but will I use most of the functions and power of the Blackberry???? Or will I be better off with something like the IPhone?
I'm don't want to start a bashing of phones, just some honest opinions.
Also, can the camera function be deactivated????

I'm a gadget guy....and may see myself using more and more, but I don't know...it would be nice if I could rent one for a month and see....yeah, that'll happen...
Anyway, thanks for listening to my rant and any insight would be appreciated...