Comparison between Admob and Adsense: which is more profitable?

Admob is a very good publisher's tool for iPhone's applications.

Based on my experience, for the same page views, such as 1000 page views,

admob can earn more than adsense.

Why?

I guess this is because the screen size of iPhone/iPod is smaller than an computer.

Also mouse allows users to click more accurately than touchpads.