My favorite daedric quest overall was probably Pyrite's though. The hardest part of the quest is initiating it, but once you've got that taken care of its a Dwemer dungeon crawl with unique enemies. I have absolutely no moral dilemma with exterminating a cult that's trying to drown me in green vomit.
I did that one (I won't do Boethiah's Calling because it's too evil

) and I think Peryite's is kinda' evil because if I understand the events: the main priest guy had second thoughts about spreading the plague so he lied to the infected, took them to the Dwemer ruins, and is pretending to commune with Peryite until all the cult members die so the plague can't be spread. By killing them and the priest we're setting the stage for Peryite to start over with a priest who won't betray him.

Oh I did start the Clavius Vile one a little while back. I had no idea what the heck was going on. I might finish it if its worth it.
Azura's star sounds fun. Isn't she the one were you have to get her becon first and then go clear out her temple or is that something else?...
Since you don't mind spoilers: you should definitely finish Clavicus Vile's quest and
not kill Barbas. The reward is very impressive and useful.

The beacon one is Meridia.