Don't forget Xperia phones, well if you go AT&T. They have PlayStation Mobile, which tie to your SEN/PSN account. Vita has PSM, and I'd bet PS4 will too. Trophy support is in the works as well. Other wise HTC phones should be getting PSM as well, but I'm not sure when or which ones will be PlayStation certified.
I know, it's an android phone, but what are your expectations for mobile games? I'm pretty sure iPhone and Android are on par for quality and content now.
I don't know much about windows phones, but unless Xbox steps it up windows phones will be the worst of the three options, meaning if they do it could be quite the contender.
So you have:
Apple. Large growing library of games. Closed system, quality assurance.
Android: Equivalent or lag behind Apple; Open system. Xperia phones (soon HTC) have access to PS Mobile games which is a new still trying to grow open system app store similar to Android itself but with Sony quality assurance. (a mix between Apple and Google's approach)
Windows Phone: Not really sure but a relatively new app store, closed system?? with quality assurance?? Xbox integration, which I'm not sure if that means games that use your XBL account, games that you can get on an Xbox too?, or what Microsoft's plans are in the future for it.
Before the PS3 everyone was nice to me :(
