I'm really not that big on Android, I think any of WinPhone7, WebOS or QNX would be better overall if they had similar marketshare.
I've never really played around with anything other than iOS and Android. I liked iOS to an extent and I think Android is designed in part for iOS castaways. From an interface perspective it is basically the same thing with more customization. What are some positives about those OS's? I never looked into them too much. I do notice that Android suffers from a few glitches now and then such as the need to kill runaway processes and other things you never really encountered on iOS.
But, the marketshare thing is the killer. I also like Google more than Bing, I don't really like any of Microsoft's programs and I assume WinPhone7 wants to tie you into things like messenger, bing, mediaplayer, etc. etc. I like the fact that Android defaults to Google Maps, for instance.