My key criteria are the ability to record while taking hand-written notes. Synchronization with iCloud and Dropbox are important too. Notabilty covers all of these points, NotesPlus covers all of them but the iCloud synchronization. I use NotesPlus because on my Air 2 it has had greater compatibility with the stylli I've been using (Bamboo Fineline and Adonit Pixel). Why my IPP on the way, I anticipate using Notability exclusively.
My writing experience: on my old Ipad 3, my favourite writing app was Noteshelf using Adonit Stylus. I really liked the infrastructre, and was very intuitive when creating new books, changing notebooks, moving pages. However, with the Apple Pencil, Noteshelf has become too 'creative" and changed my writing to calligraphy. This does look nice but I found it hard to decipher - I have terrible writing but can read my own writing, whereas the calligraphed version did not look familiar and although looked good was difficult to read.Which do you prefer, and why?
So for those with Goodnotes, have you also used Notability?
And what about Evernote? Just saw that as I was looking at Goodnotes.