The big difference is Android uses a standard back button for all applications. This leads Android users to end up mashing a lot of buttons at random, to try an

The big difference is Android uses a standard back button for all applications. This leads Android users to end up mashing a lot of buttons at random, to try and get what they want - it's actually quite a bad UI, and it was just translated from the web clumsily. This is seriously one of the most W.T.F. comments I've ever read on HN. No exaggerating. The Android back button is incredibly consistent, and the only people it causes in any confusion in are people too accustomed to the iPhone, mentally configured to always look to go to the top of the stack. There are a few apps that break the model, but by and large they work perfectly. On iOS -- and yes, I use both daily with an iPad 3rd gen and an GS II running ICS -- it is essentially mystery meat in most apps. There is no universal model beyond some basic behaviors. As one aside, it is a PITA when you're lounging with the iPad and you have to go to the top to do every navigation. There is no universe where the iOS model is better, but through completely acclimation.