The processing of the Galaxy S2 seemed a little before cheap. A thin plastic back covers the battery and SIM card. I can hardly imagine that the lid by holding long if you (while traveling abroad for example) have to change the SIM card often. Also the color quality on the screen was my feeling not as good as on the iPhone.
The change from iOS to Android was not only positive. Even though there are only a few clicks, it's just a waste of my time, if I have to first click through several pages until I get to take the desired menu item. The difference between iOS and Android is probably comparable to the beginnings in Linux over Windows. Who is accustomed to the usability of iOS, is struggling with with Android. The only pro was that I was no longer dependent on iTunes.
At the end I have the Galaxy S2 played back. The broken display of the iPhone does indeed still. As long as it does not endgütlig breaks down, I'm still satisfied with it than with the Galaxy S2.