Until using Android (specifically MIUI) for an extended period I was also thinking Sailfish was better in terms of gestures. Now, I am sorry to see how Android companies (and Apple) have already taken lead in gestures. I was not expecting swiping on the left/right edge to go back would ease navigation that much. Switching between the last used apps is also a breeze. AFAIK, Sailfish also implemented this on 3.0, but I've left SfOS at 2.x.