I thought the S III should be favourited honestly, i have had ios and android phones and i have always rathered the android.
I prefer their layouts & the fact that you have to pay for more through the iPhones like ring/notif. tones bugged me.
It's a shame, the S IV comes out today (it's the 27th here - my birthday!) but i could only get this early upgrade to the S III. I'm not too bothered though because it still makes my 3G S II look like a late '90's model phone haha.
my iphone is jailbroke so i dont have the tones/customization problem..