I would wholeheartedly recommend trying the inspire. I switched from the 3gs to the inspire, with some trepidation at first, but ultimately I am more than satisfied with the phone. I did take the route of rooting my phone (for which I would be happy to share resources / instructions that I have found) which is what takes the inspire (or any hardware comparable android device) into the realm of "better than the iPhone" for me.
The major advantages I have seen with the iPhone are the seamless integration with Google services, massive customizability of UI features, Widgets, and freedom from the apple walled garden. I do have a Macbook, which I thouroughly enjoy, so I'm not saying that out of any anti-apple perspective. There is just so much more potential with the android os.
The major disadvantages for newcomers to android will be the lack of iTunes, slightly higher learning curve, and the lesser availability of accessories like skins, cases, and docking solutions.
That's my general take on it, but feel free to ask any specific questions you might have.
Sent from my Inspire 4G using Tapatalk