Say what you will about King Sombra, but he's one figure of royalty I'd much sooner side with than I would Princess Twilight. Whereas Twilight simply questioned her role and asked for more, King Sombra sought more when he got the chance, and siezed the initiative. How do I know that, you might wonder? I don't, but the fact he has little to say makes it pretty obvious. With that established, I'd choose an efficient king who swung into action to an ungrateful princess any day.