Mines the Theives Guild, doesn't matter how many time I play it.

DB. TG is 2nd.

So far (haven't finished yet) is the dark Brotherhood. All the others feel like huge chunks were cut from the game prior to release. DB feels like it's been cut down in size too, but not as bad as the others. it's a shame too, they all had real potential to be something special, but instead, they all fell flat.

As far as other smaller quests go, I really like A Night To Remember.

For me, I really enjoy them all. I don't really RP a "specific" type of character...morality wise. I tend to do every faction quest line, probably because I like to hoard all unique items....like pokemon, I gotta catch 'em all.

I liked the DB questline, but it really only fit with one of my characters so far. I like the TG the best, though. I'm saving it for much later this time so that I can get some distance from it before doing it with my current character.

I really really really liked the DB...BUT the 'post'guild stuff could have been much better.