I got a new iPad Mini for my birthday. It is noticeably faster than the Mini 4 and I am happy to be able to use the Apple Pencil with it. I have found that GoodNotes can be configured for vertical scrolling rather than horizontal so it best approximates the Newton notepad.
The setup process for moving from one iPad to another is pretty neat. It automatically detects the old nearby iPad and establishes a connection to it by scanning a barcode with the camera. All the settings transfer and apps restore from a recent backup. Not all app settings, particularly logins, restore so I am finding that I have to check each app individually.