For me, Pages has many annoyances.
First, there's no option to do nothing on startup, so you have to close a window you don't want in the first place. If you close it so there is no window up, and go to another app, when you return to Pages, it re-opens the damn window you don't want again.
Secondly, the Zoom option is not customizable. I'm over fifty, and so I now need larger type to see without reading glasses. But I still want as much as possible to be visible. So the clumsy Zoom steps Apple has chosen just don't work for me. This is also true of Numbers.
Thirdly, Nisus is very customizable, especially using Quickeys. I've been using a Mac for over twenty years, starting with a Mac plus. So many years ago I went through the point where your arms get so heavy it's a real pain to use a keyboard and especially to mouse around. So now I try and avoid any and all unnecessary mousing. And if you haven't got to that point yet, the chances are that you will probably do so in the future... Pages doesn't seem to be nearly as versatile in this regard.
Lastly, let me echo charlie2342 - Nisus just does the everyday stuff more gracefully. And not only than Pages, far far more gracefully than Word. I have all three, and Nisus is my hands-down choice to enjoy the experience...
