They both have their good sides and their bad sides, depending on your roleplay.
If somebody wants to be a stormcloak or imperial then that does not mean you are sworn to convince him not to be one. I prefer the stormcloaks because it fits my roleplaying, but i don't go to the forums and yell at the people who prefer the empire. I mean, how amazing and realistic skyrim is...it is still just a game.
This is a forum, we debate and put forward our opinions for others to see..
I'm strongly stormcloak for all my characters (some side with neither though), I can't justify any of my characters supporting the empire that agreed to let the thalmor slaughter innocent worshippers of talos, when most of the empire supporters worship talos anyway. They are weak and a shadow of their former selves, skyrim is better of independent.