Okay. I talked to the H guy-king-prospect, and said I would be his champion. Then I talked to Bhelen's representative and said I would do his dirty work. But I felt like fighting in the Proving, so afterwards Bhelen's rep was mad, so i told him my plan was to be a double agent. Is there a way to choose to back neither, or who, in your opinions, makes the better king? --- Do, or do not. There is no "try."
No matter who you side with in the beginning, you will have the choice to change that at the very end of the quest line. So if you want to do the Harromont side for the Proving, you can and then at the very end of the quest, put Bhelen on the throne. --- "Sigging yourself is the best way to make sure everyone knows how narcissistic you are." -Xiahou Dun
Harrowmont is the nice guy, Bhelen is a jerk. But at the end of the game, you'll see a little synopsis of how their leadership handled. Harrowmont fails if you choose him, Bhelen succeeds. Kind of makes it a tough choice.