I want to start tracking hours at my current employer for Android and iOS dev since they are for the same apps. Anecdotally what I've seen is that iOS finishes faster, with way less hiccups and compromises.
The experience of the developers is also a huge factor.
I wouldn't say it is a huge factor. The biggest by far is that each manufacturer/carrier has a slightly different implementation of Android to the next. I have seen small Android projects that have hundreds of defects despite the factor being implemented exactly right.
ios has interface builder.
You can say whatever you want about it ,it's vastly superior than any gui tool for android. I really think there is a market for android better gui tools,and even a better android IDE. Android studio ,while better than eclipse is not there yet.