Reversals of fortune occur all the time in the stock market. Take Apple (NASDAQ:AAPL) and BlackBerry (NASDAQ:BBRY). The Mac maker is off 12% year to date, while the company formerly known as Research In Motion has soared 27%.

And yet, if news reports are to be believed, the two may switch places again soon. Government contractor CACI International (NYSE:CACI) has altered thousands of iPads to make them secure enough for government work, Bloomberg reports. The news follows on the heels of Defense Department officials announcing plans to allow workers to use iPhones and Android handsets. Add it up, and it seems as though BlackBerry's long-held security advantage is eroding as fast as its share of the North American smartphone market.

Should you be short BlackBerry? Long Apple? Tim Beyers of Motley Fool Rule Breakers and Motley Fool Supernova addresses these questions and more in the video below. Please watch, and then be sure to leave a comment to let us know what you think.

Fool contributor Tim Beyers is a member of the Motley Fool Rule Breakers stock-picking team and the Motley Fool Supernova Odyssey I mission. He owned shares of Apple at the time of publication. Check out Tim's web home and portfolio holdings or connect with him on Google+Tumblr, or Twitter, where he goes by @milehighfool. You can also get his insights delivered directly to your RSS reader.

The Motley Fool owns shares of Apple. Motley Fool newsletter services have recommended buying shares of Apple. The Motley Fool has a disclosure policy. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. Try any of our Foolish newsletter services free for 30 days.