Given there's 3x the types of devices in iOS land (phone, iPod and tablet) vs most people using Android phones, the difference isn't that huge. I do find, though, that I tend to browse more on Android because I need to get something done or check up on something. On iPad, sometimes I just tap around for the heck of it. :)

Nope. iPhone traffic alone still crushes all Android devices combined. And there are certainly many more Android devices in the US.