Don't compare both phones. Compare with other phones as well: the A6 vs Qualcomm Snapdragon S4. Who faster then who is King. Other than that UI smoothness I still prefer iOS. If you looking for overclocking or custom roms then you should go for Android. Honestly Android not bad at all, just lack of apps and some games can't run smooth even on the SGS3 compare to the iPhone 4S.