I'd have to say Dwarf Noble. I get the impression (from King Endrin not wanting you to have to deal with persistent merchants so you need an escort to the Provings) that as the favorite, you're a bit on the sheltered side. Everyone loves you so how could you not love Orzammar? Then all of a sudden everything changes and you're sentenced to die fighting darkspawn. That's awful but even with no trial, the Assembly did decree it and going against it isn't the easiest thing in the world...why not join the Grey Wardens? There's a Blight coming and you're sure to fulfill your sentence eventually, not to mention you get the chance to protect your home even if they want nothing more to do with you. You've fought darkspawn before and understand just what a real threat they are.
Playing a dwarf is really the only way I can stand Orzammar due to sheer length (and playing as a commoner makes me hate it almost more than not playing as a dwarf). Unlike in the other origins where you can't really tell what Bhelen or Harrowmont stand for, you already know them and have seen the dwarven traditions Harrowmont wants to preserveand Bhelen wants to destroy.
It also makes it harder to choose a King. In the Commoner origin Harrowmont thinks your entire caste should never have been born and Bhelen makes Rica happy. As a non-dwarf it really doesn't matter. Harrowmont is the only reason a DN even knows to go looking for Duncan and Bhelen betrayed you. The note from your father makes it clear Harrowmont's right about him not wanting Bhelen to succeed him. On the other hand, the betrayal wasn't personal just political and you have to go to Dust Town for possibly the first time in your life and see what it's like. Zerlinda, especially, both horrified and impressed me because her family wanting her to throw away a living breathing child when population was such a problem was unthinkable and she was clearly willing to go much farther than your own father was willing to go for you when he basically wrote you off because he wanted to keep the throne in the family.
I definitely didn't want to be responsible for removing my family from power but Bhelen really didn't show much consideration for ANY tradition except the one that would give the throne to him. In addition really seeing what being casteless was like, my PC was already questioning the caste system after getting to the surface and seeing the way elves were treated. They were both surfacers to her so what was the reason they were relegated to second-class citizens? That, of coure, made her start wondering what the basis was for the caste system, which she had more or less accepted as just part of the society before.
Another thing I liked about DNs is that the minute Alistair confesses about being royalty, she knew that there was a very real possibility that he could end up on the throne and so - when dating him - immediately broke it off before she got too involved. Hardening him was a no-brainer too because everyone around her her whole life had been out for themselves and that was just a basic truth to her that Alistair was a little slow to grasp. Marrying Alistair to Anora was a sound political move and on some occasions recruiting Loghain seemed sensible, too. That Alistair was putting his personal feelings above the good of Ferelden and not helping right when they needed him most just made her lose respect for him and made him come off as more of a child, especially as she usually ended up putting Orzammar before her own feelings and giving Bhelen the throne. If she could put her feelings aside, she had no patience for his refusal to.
Doing the ritual was a must because she wasn't a saint, had no intention of dying, and also refused to spend the rest of her life rebuilding the Grey Wardens. On the other hand, it needed to be done and Loghain was pretty much forced to spend the rest of his life with the Wardens while no one was going to be forcing their hero to do anything. Maybe Morrigan could be trusted, maybe she couldn't. Maybe she knew what she was doing with the kid, maybe she didn't. That was definitely a problem they would't be facing for two decades or so and if the Wardens were properly rebuilt, they could probably handle it. And the minute Gorim mentione she was being considered as a Paragon and confirmed that she was, indeed, no longer an exile she wondered why in the world she was still in Denerim.