Who should be high king

I'm doing the quest to retrieve the crown. I was originally going to pick dunncas because he seemed neutral ground and wanted peace, but I ran into derdre and she wants to rid of the colonizers and I see her point. They disrespect the land and natives, I would want them gone too. So I'm stuck between the two, should I king the crown to her or dunncas.

(Ullan is out of the question, I'm still bad at him for double crossing me.)