My favourite quest is Hail Sithis! Because I enjoyed killing the Emperor.
Too short and too easy. It would've been better if you actually had to hunt them down one by one by one and kill them that way. At least that's how I feel about it.
Personally, I've always liked Sanguine's quest. You get a really sweet reward at the end, plus, you get to hang out and party with a Daedric Prince. How cool is that?
Season Unending. It's my favorite quest not just in Skyrim but in the entire series.
HEY, I ALMOST MARRIED HER!!!!
I will always love that sweet old hag...NOT!!!
My favorite part of that quest was kicking Elenwen out from the negotiations.
Ill Met By Moonlight, a quest that has no easy answers.
You can either let Sinding go - and thus let the murderer of a helpless child go free - or you can hunt him down like an animal for the amusemant of the Daedric Prince he offended.
I don't know that I really have a favorite. I destroyed the DB too, that was fun but too short. Companions, but also too short, though I'm on pc now and with a mod it is so far much better! Not nearly finished yet. I liked the single quest Waking Nightmare very much. The TG was fun too. I can't really choose one.
short... but fun
Mind of madness
Shegorath always has the most fun quests and lines