I just recently got back to the iPad Pro scene. I had the first iPad pro several years ago. I actually used Notability at the time. I recalled it would sometime have issues taking in large PDF files? say 50-70MB? there was something that really bothered me at the time. I think it suffer from having hard time dealign with large pdf and writing sync issues on it? The other one I have is PDFExport. I think I got it for very cheap several years ago, just got it back last time and it still works very well.
Unfortunately still an issue. I tried once or twice to import such big files and it failed. I ended up with over
200! empty pages that I had to delete manually as you cannot delete multiple pages in Notability with one action. Quite annoying really.
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For easy sharing in Notability what I do is auto-backup to PDF format to OneDrive, from which I can share the PDF notes with other team members. Not everyone that I work with has OneNote experience so I find PDF sharing easier. OneNote has its infinite canvas setup which isn’t conducive to PDF sharing so I don’t use it. Generally I find Notability quite powerful.
True that if you want to export in PDF OneNote is not the best option due its infinite canvas. However at work we all use OneNote so I do not need to do export. I just share the OneNote notebook itself and that's it. In this sense Notability way is slower (having to export to PDF and then share manually and you have to do it whenever something new is added).
Both have their perks and I use both apps for different purposes. OneNote is great for typing meeting minutes. You can have the template, you can use tags and add TO DOs and you can with one action share with others for the whole life cycle of the notebook. Notability is about handwritten notes that I do not need to share for example with all of my team and that I can share only once the need arises.