4: the fact that Android has unified gestures: back, home and tray. Whenever I used iOS, I felt like every single app had a different way of going back somewhere. On Android, this is not an issue at all.
Uh. I used Android for 15 years and I still keep guessing wrong what the back button will do. Feels like 75% of the time it does not lead me back to what I expect and all apps have different ideas what they think it should do. I agree though that not having a back button at all is also not good.
