[MatthewPhillips]

> iOS’s tab bars are anchored to the bottom of the screen, where your thumb more naturally rests, so it remains easy to change app sections (contrast this with Android’s tab bars, which are usually located at the top of the screen, and sometimes out of reach).

I disagree with this, I think navigation should be at the top because you use them infrequently. What you do do frequently is scroll, and navigation being on the bottom gets in the way of trying to scroll.

However, this is just my own personal observation. I'm not going to write a blog post on how it is a scientific fact that navigation is better when on the top.