Android vs iOS; A Usability Battle

Lately I've noticed a number of articles with gripes and groans about the Android user experience, the way interfaces are designed, the usability of Android apps, and a lack of satisfaction with the whole Android ecosystem.

As someone who works on day-to-day basis with usability testing and user experience design, my interest was piqued. Were these users just iPhone users who expressed dissatisfaction after a brief flirtation with Android, or was there something deeper going on?

I can't honestly say I've had a lot of experience with Android - although I do own two iOS devices - so I couldn't write off these concerns one way or another. But rather than basing it off a few, possibly biased opinions, it seemed the fairest way to compare the two was to set up a quick usability test.