I'm gonna have to say Storm cloaks, mainly becouse you know, the Imperials tried cutting my head off that tends to sour any relationship. I always choose being a Nord just becouse...well...I just like being Nord. The way I see it the empire is crumbling any ways, no scence just letting them take skyrim down with them, Id hate to see the Thalmor victorious. Thats why I side with Ulfric on this one, though allot of his followers are some mean ass racists I think there cause is worth fighting for.