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You didn't ask me but I use Nebo; I found out about it when investigating the file format used by the Kobo Elipsa. I like it because of its realtime handwriting conversion, no recurring fees, cloud sync and backup, and easy export to pdf with text conversion preservation.

My student son put me onto Notability yesterday (I got a new ipad pro). It's pretty cool. He swears by it for all his math and economics lectures.

I use Bear.