Using an Apple Pencil to mark up a PDF on an iPad

Which app would TidBITS members recommend for a new iPad Air (iOS 13.3) for marking up corrections etc on PDFs using a 1st generation Apple Pencil?

I use Documents by Readdle. Good PDF viewer, good pen integration, and you can sync with Dropbox/Box, so I can throw things from my Mac to my iPad without difficulty.

Thanks. Derek

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I recommend PDF Expert. Works really well.