Android here too. (Galaxy Note 1). Like it as i can tinker with it, especially custom roms. The one i'm running right now is JellyBean, with the latest Samsung 'bits', including multiscreen, but still getting 50% battery life than stock. Can't play around like that on the other OS'es.
There's no other OS i'd move to, currently. I've dabbled with IOS, and Windows Phone (again, custom WP roms on an HTC HD2 i had for a long time), but they're very limited in what can be tweaked. Especially IOS, ie; nothing can be played with.
The new BB OS is long way from being competitive, imo. Played with one of the new ones recently and see a lot to be improved.