For different reasons, I like both sides almost equally.
[hider=Empire]Pros:
- The second half of my username is Empire
- A unified empire can take out the Thalmor if properly prepared. I hate the Thalmor more than I hate the Pokemon Talonflame. And I [i]really[/i] hate Talonflame.
- General Tullius has a magnificent set of armor.
- Killing Ulfric lets me turn him into a Dead Thrall whose body doesn't even turn to ash once it dies. What's not cool about that!?
- Jarl Balgruuf for Whiterun

Cons:
- Banned Talos worship. This is a big one.
- Titus Mede II = not a Septim. Forget what canon says, I want them back.
- Mustaches on the soldiers generally look stupid, and their uniforms suck.
- Something about them just doesn't feel right to me. Dunno why.[/hider]
[hider=Stormcloaks]Pros:
- Y'all motherfuckers need Talos!
- Really Nord-like Nords. Skyrim made me love a race I didn't really care about at all in Oblivion.
- I don't like the Battle-Borns, so it's fun putting them in their place by sticking Vignar in the Jarl spot.
- Leader can Shout. Not a big pro, but it's cool.
- I get to wear Tullius's spectacular armor.
- Despite everything, I think Ulfric's a really cool guy.
- Much more interesting if Skyrim gets taken back.

Cons:
- Balgruuf isn't Whiterun Jarl.
- Racism against my favorite race, and every race that isn't Nord (second favorite)
- Can't make Ulfric a Dead Thrall.
- Canon will probably say Ulfric lost anyway, unless Bethesda thinks it'd be as interesting as I do or they just like him.[/hider]
In the end, I like Stormcloaks [i]juuuuuuuust[/i] a little more.