I require a comparative analysis of Android, IPhone and Blackberrys

I am looking for someone to produce a comparative and unbiased analysis for a business to determine the pros and cons of switching from Blackberry to IPhone or Android (or staying with Blackberry). I am not looking for fluffy mass marketing information such as "This one is bigger!" or "That one has nice colours!", but rather a clear breakdown of the pros and cons of what these phone operating systems do well, where they fail, and where they can provide extra value to a company. For example, which Phone OS can allow encrypted access to their file server? Which can be remotely managed by IT? If it can be managed, is it easier with one over another? Which systems are easier to develop an application for? And implement? Please be sure to have a couple of paragraphs of text in your proposal so I can also evaluate your writing skills - I do not have time for significant editing of your work, so if your writing skills are not excellent, please do not bid on this project. This doesn't need to be a massive document - one or two pages if it's concise and well laid out.