It wasnt a hard decision at all. Ulfric can hardly be said to be rightful king by fair combat using the voice. One guy has a pistol, the other guy has a pistol and a nuke. Hardly fair.
Except using the Voice IS part of the Old Ways. If anything it provides Ulfric with more legitimacy.
Plus Imperial law supercedes the old way.
That's not really how it works.
Plus Ulfric is just a power monger who was a Thalmor lackey until he had enough power to tell them off.
And the Empire wasn't a Thalmor lackey until they lost their power and became one.
Plus the whole thing about outlawing Talos is a Thalmor plot the Stormcloaks are wilfully and ignorantly playimg out.
Only if we ignore the metaphysical consequences of outlawing Talos worship, if we do account for them it's the empire that's ignorantly playing it out or they wouldn't have banned Talos in the first place.
Plus the Stormcloaks are only 3x as racist as the Empire, which takes some doing.
If you ignore the non-racist Stormcloaks, the fact that the Dunmer themselves are at least as bad, that the so-called ghetto is only a ghetto because they call it one as it doesn't really look like one, that there has just been a major war that was essentially racial in nature,...
,Plus they are hypocrites, since they did to the Forsworn what they are complaining the Empire is doing to them.
the original Reach conflict was thousands of years ago. That's like a bunch of Scots claiming Pictish indepedence.
But big picture: Rome in decline but still powerful? Or the KKK. Easy pick, really.
except the Empire isn't Rome (not that RL Rome was actually all that good), and the Stormcloaks are only the KKK if you focus on one thing and ignore all the rest.
From a lore perspective, I think any option could work. Maybe the Dragonborn is Argonian and helps set up the Reign of the Black Marsh. Or whatever. Should be interesting which ever way they go.