After Using Galaxy S3 for over 2 weeks, I am embarrassed to say that I do miss my iphone 4S. I know, I would probably be "killed" for saying that. For one, I do find Android interface UI not as user friendly as iOS. Secondly, some of the apps designed for Android lacks functionality as compare to the SAME apps designed for the iOS. Although Android OS provides plenty of customization but its too fragmented. I could do much better and easier customization on Jail Broken iPhone 4S with Cydia installed. Last but not the least, I have a feeling of massive memory usage/leakage r/t installed apps+ OS. May be the coding of the OS or the APPs (or a combination of both) is not strictly monitored for the memory leakage.
The built quality of S3 is so so as compare to iPhone. It feels more platicky despite $650 price tag for unlocked international version. But this is device related and has nothing to do with the OS or Apps.
But for now, I am going to continue to use Galaxy S3, re-evaluate in October when the new iPhone is introduced. The only thing I dislike about Apple is them being control freak and inability to easily JB iPhone. I know I am taking a big risk of posting pro-Apple post, but this is just my honest opinion based upon ONLY two weeks of usage. As I explore more of Android system, I may change my mind, so please go easy on this newbie Android fan