For me, a "fluid" operating is a poor reason to get an iPhone over an Android phone...especially since the high end Android phones on ICS and Jelly Bean are quite fluid.
And if you think the iPhone "just works", you are sorely mistaken and have fallen for their advertising lies.
Just one example of all kinds of issues and problems the iPhone has:
The Latest iPhone Problem Apple Has Yet to Fix: Audiogate - Technology - The Atlantic WireNot to mention antenna issues, screens that crack easily, activation issues, poor battery life, Siri doesn't work even remotely close to how the commercials say and sometimes won't work at all, screen tint issues, camera shutter issues, etc.
There are many sites that are dedicated to dealing with problems with the iPhone.
Errors - iPhone Problems
I have known a handful of people who switched from Android to an iPhone, thinking they would love the iPhone. Most hated the switch and a few switched back to Android.
The iPhone just doesn't do as much as Android can...and once you have used a good Android phone, the iPhone will seem like a little kids phone.