To me, Vengeance is the hollow choice. It's the choice where Hunger throws himself back into another war, back into strife and suffering, for something that he will most likely never actually obtain. It's the choice that sacrifices the efforts we've made this entire quest to keep him alive and give him a good ending. It's the choice where the living out the ideal of what the world should be is thrown aside in favor of the ruthless pragmatism of what gets the ideal world fastest, regardless of the human costs along the way.
It ends the quest on a question mark. Did Hunger succeed? Probably not, but we can't know for sure. His dalliance of a season never came to an end, he never got the happiness he deserved for all his hard work. Instead there is war for countless eons, with an unknown outcome.
With Freedom, we can walk away knowing that we did succeed for certain on one thing. We gave Hunger a life, a family, enough power that his remaining burdens are not threatening anymore. A chance to know peace, to fish with his child and not have the lurking threat of the Bane of Heroes ready to ruin things for him again.
In short, Vengeance is fundamentally unsatisfying as an ending. It demonstrates that he hasn't really changed since the beginning of the quest - if anything, he's gotten worse, since he's now willing to betray the Accursed. (And make no mistake - failing to do the favor he promised the Accursed is a betrayal. You can argue it's a justified one, but a betrayal for good reasons is still a betrayal). Freedom at least shows that Hunger has learned to value his own life, his happiness, his loved ones. Vengeance Hunger values only the goal.
What an empty existence that would be.
