So I've narrowed down my decisions to letting either Anora or Alistair take the throne. I know that if Anora takes it, she exiles Alistair, or so a friend told me, but I can get Loghain in my party. Just wondering if one option was clearly better than the other or not.
Anora rules alone with making unhardened Alistair remain as a grey warden in the party with Loghain dead. Anora rules alone while sparing Loghain and getting rid of Alistair. Unhardened/Hardened Alistair rules alone with Loghain dead. Alistair marries female human noble player. Loghain must be killed. Human noble male marries Anora. 2 options have unhardened Alistair kill Loghain or spare Loghain and Alistair leaves Fereldan or you execute him. Alistair and Anora rule together with Loghain dead.(Player must kill Loghain or Anora won't marry Alistair.) Hardened Alistair and Anora rule together with Alistair leaving the party and Loghain joining the party.
That's because you didn't "harden" him during his personal quest.
Gameplay wise, I'd like to keep Alistair if you were using him as your main tank throughout the game. Loghain can't fit in tank role very well due to the auto-levelup crap. If you've made Shale your main tank not Alistair, than that's doesn't matter. But anyway, Loghain isn't very useful because you get him at the very end of the game, and not being able to build him.