Also, among all the drawing Apps I have (SketchBook, Adobe ink, Paper, Bamboo paper, Inspire Pro...) I highly recommend "Procreate" by Savage Interactive, right now it's the only App I'd like to use on iPad drawing and sketching.
Since I've had the iPad pro I've tried almost all the art programs I could find and keep coming back to Procreate. It's the most intuitive, best working art program on iOS right now. If they would just add better selection features, it would be almost perfect. When using some of the others, I find myself 2 finger tapping to undo
I considered getting a Mini 4 to have a more mobile solution, but after using the Pencil vs the other Styluses, it made the difference. If they ever make it where the Pencil works with the smaller ones, that would be great. Knowing Apple though, they may not do that for 2 or 3 generations. They are notorious for making sure not to cannibalize product categories and they may feel that releasing an Air or a Mini with the the ability to use the Pencil one generation after launching the Pro would be against their typical product release cycle, especially since they are having such a hard time getting Pencils out, but, like I said above, all the "whispers" say the Air will have it so who knows.
I thought the Pro would be too large but it really doesn't feel as large as it should. I guess since I'm coming from the Cintiq Companion Hybrid as my only tablet, it's CONSIDERABLY more portable and usable on the go. It's not more difficult to carry than a typical professional notebook folio. It's so thin and light, it's really surprisingly portable.