I think Dragonborn is by far the best mainly just for being able to remap perks. It's great for people who have a level 81 character to switch up between different play styles. I started out as a one handed weapon, heavy armor build, then changed to a pure mage, and now I'm using a thief build all with the same character. --- http://psnprofiles.com/TheRavenKC Play Like A Raven http://www.xboxgamertag.com/search/TheRavenKC/
Dragonborn, easily for me. Solstheim is just awesome.
Dawnguard was cool too. I did enjoy exploring the vale. But overall it's not close to dragonborn. --- If I ever cared about what you had to say, I'd stick a shotgun in my mouth and pull the trigger with my toes.