They all suck. Windows Phone and iOS are too restricted, Android is not polished enough and seems very inefficient. Symbian is dead and I don't know how the more recent version were, and I have no clue about Blackberry. Meego had potential but it died way too quickly. Sailfish has potential but will probably fail with not enough support.
The title is slightly misleading as typically when people mention OS, they mean PC OS, not mobile OS. In that regard I would very much like to prefer Linux but it's hard when most games are on Windows only.







