2.0 ghz Quad core ( Samsung Galaxy S3 ) vs 800 mhz dual core ( iPhone 4S)( both are made by Samsung )
Apple tends to underclock their stuff because iOS simply doesn't need all that power to run.
I am both a iPhone and Android user, and I can say, that iOS doesn't need all them fancy dual cores and what nots.
But I'll also say that a flashed ICS ROM is a smooth as iOS.
And yet somehow the iP4S is quite happy running highly demanding stuff like Infinity Blade on its lowly 800mhz cpu.
For such a high demanding game, it's quite a boring one