Brett Kelly prefers the full sized iPad because of the screen size and quality.
I have been using my iPad as a mostly-complete laptop substitute for a good while now and it’s been wonderful. The number of concessions I’d need to make in order to adapt the mini to such a role are simply too many.
I think this is why the iPad mini works for me. I don’t try to use it as a laptop replacement. Although I have no doubts that I could get by with just the iPad mini if I had to.