Stormcloaks against Imperials.
Who is right, who is wrong?
Who is the lesser evil?
Personally, I support Ulfric. Although he is supposedly racist ( he only treats argonians and dark elves like shit because they refuse to join the war effort and are eating away at his resources, so I can stand by that ) and wants to lead Skyrim with an Iron Fist, I think he has higher odds of keeping Skyrim stable than the Empire.
The thing with an independent Skyrim is that they can defend their lands. They are used to the cold and the beasts that roam the land whereas the Thalmor are not. I truly think the Nords could hold Skyrim for a long time against the Thalmor to the point where the elves would be unable to conquer it, since they'd be far from home and their supply lines.
Also worth noting that the Thalmor only have bases in skyrim because the Empire allowed them to and protects them due to fear of war starting again ( which the Thalmor want ). Doubt they'd be able to get a foothold in Skyrim without the Empire's protection.
On the other hand, an Empire controlled Skyrim would mean Nords sent to fight on foreign lands, where they lose their ability of resisting extremely low temperatures. Although the Empire is clearly stronger than Skyrim, I feel Skyrim has better chances of survival if it defends its own lands instead of committing troops to an Empire that has abandoned its provinces before, when it suited them.