I like the mini better, easier to balance when typing because your hands are closer together. The less weight means its less top heavy. The screen size is no big deal, considering it is much bigger than the one on the phone that I use all the time.
I have used both pretty extensively and if you are going to be doing presentations standing up holding the ipad in your hands the mini is far better suited for that, but the kb on the full sized is a lot easier to type on when sitting down.
---------- Post added at 07:00 PM ---------- Previous post was at 06:53 PM ----------
MS OneNote is supposedly good.
Also Notability (does PDF annotations) and Notes Plus get mentions for there handwriting ability also
I use MS OneNote for work and love it. It’s very smooth and syncing online so you can access it with any device is killer. Not to mention the ease of dropping in files, pictures, making tables, etc. I’ve completely stopped using a paper notebook at work.