Assuming the pandemic will someday pass, I prefer FaceID on my phone and (eventually) Mac, and some form of TouchID for my 12.9" iPP.
I always look at the phone and Mac screens face on with camera on top, but the iPP is most often on a table top for note taking, or in landscape with my hand over the camera, or in some other configuration that makes FaceID a chore.
Put the FaceID sensor along the long dimension of the iPP, and give it a superwide fisheye lens, and I'd prefer FaceID across the board.