If the OP has had 6 Galaxy S3's after owning iPhones it could also be argued that he was dissatisfied with the iPhone for at least as many times. Not a great endorsement for either phone. Perhaps a Windows phone beckons.
That is actually quite a valid point.
I, too, don't understand why you'd attempt to switch to the same phone 6 times. There are more flagships out there...
iOS 7 feels like it lacks fluidity and responsiveness, mostly because it does. Having to often repeat gestures and taps because it doesn't respond until everything is perfectly settled, or to start typing and have it only start responding 5 letters in, then have to backspace it all and start over.... kind of ruins fluidity because of its lack of response.
I haven't had an Android phone since the Galaxy Nexus was released two years ago, so my opinion isn't really relevant anymore. I did give up on it after a month though, and got a 4S. I'd find it easier to leave iOS though, I suspect.
I haven't tried WP but I wonder how it fairs in this area.