Although not having used Android specifically, I can easily see the UI designer being poor compared to iOS's. I still have yet to see anything as good as Interface Builder for any other platform, and I think a lot of it just boils down to the fact that when IB was designed it was actually considered to be "the right way" to make pieces of your app from the beginning, as opposed to something bolted on later. Making a nib less app is really hard in Cocoa. A lot of stuff in Cocoa/Touch just makes more sense from a UI builder perspective than a hand-coded perspective. The new constraints API which is absolutely awesome is a good example of this for desktop Cocoa, and the storyboarding stuff is a good example for Cocoa Touch.