Which type of Output Window should I use?

There are 2 types of Output Windows:

1. the "Viewer" (the modern way) and
2. the "Draft Viewer" (the legacy type as Microsoft would say)

I always use the Viewer because of the added flexibility regarding editing graphs and pivoting Pivot Tables. The choice of Output is made using the menu: Edit > Options and clicking the General Tab. In the "Output Type at Start-up" box,  click Viewer.