I love both my iPad 4 and my new Nexus 7 2013. And am a fan of both iOS and Android for their different strengths.
My iPad is very reliable and consistent. But also boring and limited. I can install tons of apps on this iPad and the performance of the iPad always stays the same. However Apple has let iOS get stale, it really hasn't changed much in the years I've been using it. And iOS is loaded with limitations such as no file system, no widgets, no third party apps (without Jailbreaking), etc.
So I love that my iPad is always so consistent and fast, and has a great tablet app ecosystem. But there are things it won't do for me.
On the other hand my Androids are more bold and reckless, they'll do whatever I ask of them, even if it's not a good idea. When I load apps, launchers, widgets, etc they have a significant impact on my experience and functionality, but also my performance with the device. My Android is more nerdy and requires more tinkering and effort to keep running smoothly.
Not sure I'll ever be able to just stick to one. I don't see Android ever providing the consistently smooth and stable experience I get from iOS because it's too open. And iOS ever providing me with the freedom and functionality I get from Android because it's too closed.