Hmm, I did try the S3 at the cell carrier outlet. The OS/UI seems smooth and and un-intrusive.
I suspect because the iPhone 4S has the same OS as my iPhone4, the experience for iOS n the 4S will be marginally better than 4. On my 4 it sometime stutters for some reason.
My practical use will be all day at work mp3 player (through BT on my BT headphones). I occasional play games on it while on the bus to and from work or taking a .....nevermind. I also surf the net as well so........
If S3's android will allow me to simply drag and drop / delete my files (mp3s and vids) as needed to and from my computer to the phone, then that to me will be a big big plus. Any android users would like to verify this please?
Battery life is though a major factor, the S3 has a huge ass battery but, the screen is also bigger...I have read reports that the battery life even in heavy usage all day (ie vid looping and web browsing) was 9-10 hours. On my iPhone 4, I have to give it perk me up charge at work...mid afternoon. All i would have done is listen to music through BT and occasional web surf.
So for me it probably will be S3...most likely..i have to look for reviews of S3 with GAMES!
PS- It also seems that cooked ROMs are already available for the S3 too!!