I currently have an iPhone 5 and a nexus 7 2013. Since getting my Nexus seven I had considered this switch over to Andrew Boyd from Apple. I have had an iPhone since the iPhone 3G got the iPhone 4 and now the iPhone 5. I may hold out for the iPhone 6 to see if the screen is larger and offered many vast improvement. However the Nexus five is very tempting to buy out right and sell my iPhone 5 pay it off.
I am at AT&T the Nexus five is a viable option. I would rather not get a Samsung mainly because of the skin that's on it and all the extra bloatware. But the galaxy five is definitely an option even go to galaxy 4 very nice as well.
The fact that AT&T doesn't allow unlimited tethering and the iPhone cannot tether without being jailbroken otherwise starting to push me away into android.
After having used both ecosystem iOS 7 is more polished in a little smoother but you are much more limited in what you can do any options of customization.
Yeah, I think you would be happy with either the nexus 5 or the moto x. Both are great phones.