Having had extensive experience with both camps, and being on Android for the past 2ish years, I for one can't wait to go back to Apple when the next phone is released.
I've had the 3G, 4, 4S, 5, and in recent years the Samsung S3, S4, HTC One X, and HTC One. The build quality of Apple phones are still leagues ahead of anything else on the market, and I like the way things "just work." Sure with Android you can tweak things and flash all kinds of ROMs to your heart's content, but in the end the apps are much better designed on iOS, and I still don't understand how after so many years Android still doesn't get the scrolling right.
The only reason I switched in the first place was for the bigger screens, so hopefully later this year Apple will knock it out of the park with their iPhone 6.