Honestly, I'd like to see the Stormcloaks become part of the legion and kick the Aldmeri Dominion out. But that probably won't happen, ha ha.
but yeah I'm playing through the Imperial questline just to see how it goes but I prefer the stormcloaks. I'm not a fan of Ulfric and Galmar, but I do believe the people of Skyrim should take their land back. (Including all races c: )
The Stormcloaks lead a cause that I agree upon. The independence of Skyrim is paramount. But, the Nords must see Ulfric as the wrong man to lead such a rebellion. Any man who dares kill the High King with a shout is not worthy of being called 'ruler'. The Dragonborn must rule, lest Skyrim be plunged into chaos.
I'll probably join them at least once, just to see how it goes. Same goes for a few other "one or the other" decisions, such as maybe siding with the Blades just once, rather than the Greybeards who I vastly prefer.