My favorite by far is the companions. This is most likely because I like to play warrior characters. It also gives you a sense of pride (and accomplisment) for being an honorable hero.

I like the Deadric quests, especially Sheogorath's quest for the Wabbajack.

The Dark Brotherhood was my favorite storyline to play through. I loved the NPC's, and the setup with the Emperor was pretty intense!

I liked that too, when I made my assassin character build, it was really weak though.

The Dark Brotherhood. After all, that is where this one finds home. And work. She also finds enjoyment in the tales of her glory. Especially the death of the Emperor. Thank the gods that the Stormcloaks are too dull to realize that this one killed him. They would not like a member of the Brotherhood amongst them.

Kow

I liked that too, when I made my assassin character build, it was really weak though.

This one believe that you may have chosen the wrong path if your abilities caused you to be weak. Light armour, sneak, one handed and archery are the best one to train, in this one's eyes, that is.

Hey, in my opinion, the best questline definitely has to be the Thieves Guild questline.

I just love the Nightingales and the entire dwemer finale was just awesome. It also included some of the best equipment in the game!

Lo Vonun Vahzen

This one believe that you may have chosen the wrong path if your abilities caused you to be weak. Light armour, sneak, one handed and archery are the best one to train, in this one's eyes, that is.

Yeah, I am just not one for sneak.

Does the Dragonborn storyline count? That was my favorite. The story really had me hooked, Miraak was a great villain, Apocrypha was a terrifying/awesome place to explore (plus there's a lot of books in there, I love to read them to learn more about the lore). And it's reminiscent of Morrowind, which is cool. The armor, more creative dungeons, shouts like Bend Will and Dragon Aspect, characters, freakin' werebears, all a great time.

paarthurnax

The Dark Brotherhood was my favorite storyline to play through. I loved the NPC's, and the setup with the Emperor was pretty intense!

That was a great storyline. SPOILERS:

When Astrid betrayed you I wanted to end her life. We were a part of a family and she would sacrifice us so that she could still live. The second best was obviously the bard's college.

Deyra

Does the Dragonborn storyline count? That was my favorite. The story really had me hooked, Miraak was a great villain, Apocrypha was a terrifying/awesome place to explore (plus there's a lot of books in there, I love to read them to learn more about the lore). And it's reminiscent of Morrowind, which is cool. The armor, more creative dungeons, shouts like Bend Will and Dragon Aspect, characters, freakin' werebears, all a great time.

That storyline was addicting and cyclone is the best shout. Miraak was annoying which made the fight better and seem more enjoyable.

I agree with that, I really enjoyed it. But all other fights were near impossible.

My favorite storyline from any TES game has to be the Dark Brotherhood from Oblivion. My favorite from Skyrim is the Dragonborn DLC questline.