I find it hilarious that even though the Stormcloak supporters are mainly Thalmor haters, Ulfric is the reason the Thalmor further involved themselves in Skyrim. I'm going to show a few points.
1. Ulfric does not get enough credit for killing Torygg. He faced the high king in honorable combat, and killed him. Most of the witnesses refused to believe this.
2. In my honest opinion, I think all of the Jarls who support Ulfric are [censored]s. Laila is a selfish and corrupt leader, controlled by her steward. Skald has an ENORMOUS chip on his shoulder, and goes so far as to almost not allow a former Imperial into his city. The Jarl in charge of Winterhold makes false accusations against the College and sways his citizens to dislike the College of Winterhold as much as he does.
3. I prefer the Jarls who support the Empire. Balgruuf>Vignar, simply because I liked his character throughout the story. Maven>Laila because my character is in the Thieves' guild, so it benefits them to have Maven on the throne. Not to mention, she was always in charge. Her title as Jarl is just "A formality".
4. People don't give Igmund enough credit. The reason he wants to keep the Forsworn threat in secret is because he doesn't want his city to turn to chaos, have people leaving left in right in terror, etc, etc. Instead, he has the Dragonborn deal with it. He doesn't want his citizens thrown into dismay.
5. If you don't like the Emperor, you can just
6. If you don't like having Thalmor officials in the holds, you can
Spoiler kill them all, run away, wait for three days, then come back.
7. Balgruuf hates the Thalmor just as much as Ulfric/Vignar do.
Spoiler His son tells you this during one of the Daedric quests.
I have a few Stormcloak characters and a few Empire supporters. But overall, I think I like the Empire's ideals more. (Although I don't really think Elisif will make a good leader at all. I think Falk or Balgruuf would make a better high king, although I know that wouldn't happen.)