For Blkackberry Storm the advantages are: Stereo Bluetooth capability (a good opportunity to listen to your music collections via Bluetooth, wireless headsets without buying a third-party adapter), Removable battery (in case of using up it can be replaced by a new one easily, while the iPhone’s battery is fixed in), expandable memory (an expandable microSD media card slot allows to accommodate cards up to 16GB, but many prefer the iPhone's fixed 8GB or 16 GB memory to a Stoprm’s tiny extra card), Video Recording(for those who consider video capture more essential Storm is better for its 3.2 megapixel to the contrary of iPhone with its 2.0 megapixels).
As for the iPhone 3G: it’s now second-generation, it has a pretty cool design. What makes the Phone usability simple is the famous Safari browser. Surfing and zooming with two fingers on the pages is a real happiness. On the Facebook wall posts, friends, photos, all that becomes easier to arrange with iPhone which displays all the strengths of your community that are on the screen of a real computer. It possesses iTunes App store with a huge variety of iTunes, iTunes integration and iPod media player. So if music listening is your favorite leisure go ahead with choosing iPhone. As for Wi-Fi support with 3G you can have quite convenient internet score wherever you go. Regarding the applications it still remains better than Blackberry devices.
At the end it should be noticed that no matter who you are - the busiest businessman or a joyful teenager both of these devices might be quite attractive for all of you. Perhaps the best solution is to acquire the both to satisfy all your inner needs.