I have found iOS to be very difficult to use (maybe difficult is not the right word - user unfriendly is probably more apt) - it's a pretty inconsistent operating system. For example, when you want to back out of a screen in an app in android, you hit the back button. If you want to back out of an app in iOS, you have to hunt inside the app for a back button (they allow the devs to decide where to put this - it varies from app to app), or hit the actual button on the phone to go home and then go back into the app from scratch. That right there, is enough for me to stay with Android. I love widgets and the ability to hide your app shortcuts in an app drawer - iOS has none and other than folders, you cannot hide app shortcuts - iOS is one big app drawer. I like the hackability of this operating system - yes, you can hack iOS as well, but it's not nearly the same experience. Google Nav is SO much better than anything on iOS - I had a caravan full of GPS and iPhone users following me to a restaurant the other day b/c everyone had gotten lost on the way to the meeting spot with their navigation devices/maps on (true story).
That said, my wife LOVES her 4S and hated her two android phones and thinks I'm crazy for staying with Android. It is 100% about personal preference. The ONE thing that kills me about this Rezound is the battery life. I carry an extra battery when I need it, but my OCD always tugs at me when I see the battery life draining right in front of my eyes. I was on my daughter's iPad the other day and was at 100% battery life with the screen on for like 25 minutes. That would never happen with my Rezound. It's the one thing that makes me go "GRRRRR".