I switched just recently from being and iOS user for years. I really enjoy Android more, but this is completely a personal preference and I can make usage arguments for either operating system. iOS isn't bad by any means, and the simplicity is really nice under most circumstances.

Android has way more flexibility and the interface seems way more logical to me. I feel like I can get more from my device and accomplish tasks quicker.

Either way, it's silly to make this a "phone war" deal, since I think they just appeal to different types of users.