How do you rate your development experience on Android compared to iOS?

I manage a team of mobile developers. Android team always lags in delivery. Whenever I discuss with them, they say that the iOS team has it easy because of IDE, simulator and instrumentation. I have not developed in android. So I have no idea about the ease of development with respect to coding, IDE, design, simulator and instrumentation.

From this article, it appears that android development costs 30% higher than iOS. This figure (30% higher) approximately aligns with my own experience. Just that, I'm not able to believe it could be true (I can't believe Google or 3rd parties would not have made development easier)

So,

1. aren't there any 3rd party IDEs / widget libraries that can help speed up UI design?
2. aren't there any instrumentation tools that can help identify memory leaks?
3. what is your opinion about the article (is it true / not true that android development is expensive than iOS)?