I find that android is a developing market when it comes to OS and applications. Here's what you want to think about.. Do you want to play games, and watch videos on your phone? If you do then do not even think blackberry. Web browsing sucks on any of their devices and the screen is way too small for it to be enjoyable. If you are more of the business type that needs e-mails and reminders and schedulers and such then yeah.. blackberry is not bad. If you have dismissed blackberry all together then lets talk android and apple. Apple in my opinion have had more stable OS updates then android, the app market is much larger with apple however android runs open source wich means even you can create an app and put it up on the site.. Personally, because I love playing games on my phone, looking at sports highlights, watching youtube etc, I have and will always use iphones. They do e-mail too lol.. By the way I infact work for the largest telecommunications company in Canada.. I receive feedback from customers all day long and iphone always comes to the forefront.
TLDR Version: Business type use: Blackberry
Actually have fun with your phone: Iphone