This is meant to be an ongoing list of software alternatives I've evaluated, the pros and cons of each, and which I ultimately favored. It's mostly meant to remind me why I did or didn't switch so that I don't waste time re-evaluating in the future when I get annoyed by a bug or UI issue in the one that I chose. In case this helps others, I've posted it here too.
Winner: GoodNotes, for now
GoodNotes