The Samsung Galaxy S3 has a larger dimension of 4.8 inch making your view more comfortable whereas the iPhone 4S has smaller- 3.5 inch display and the advantage goes to S3.
iPhone 4S is very easy to hold but i bet it is very difficult for you to handle S3 because of its larger dimesnions. And as a result we can operate 4S with one hand where as for the S3 you need both your hands to operate this and the advantage goes to 4S.
Both the phones have an entirely different operating system. The Android - ice cream sandwich of S3 allows easy customization, but with iOS you cannot cusomize your homescreen to the extend that you think. But to be truthfull iOS is the best easy learn OS this can even be used by our Grand parents its soo easy to use. S3 is more like your personal computer and can be readjusted but in iOS we are made to obey rules of Apple , like itunes.
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