After playing through the dwarf noble origin story I had an incredible bias in my choice and decided Harrowmont.
- Bhelen, at the end makes a much better king than Harrowmont. The former aims for the future while the latter, thinks everything is 'just fine.'
- If you start as a dwarf then you have a pretty clear choice. The dwarf commoner's sister is Bhelen's mistress so you'd help him in order to help her, but the dwarf noble gets betrayed by Bhelen so the choice is clear there as well. If you aren't playing as a dwarf then it comes down to whether you want to help the weak, nice candidate or the brilliant and capable slimeball.