If you are Nord, choose Storm, because people in the cloak of Storm discriminate against races other than Nord. If you are not Nord, it will be bad for you. .
You can attack the city, you can join the empire, you can go to the city controlled by the storm cloak laid by the imperial army, and then you can cut off Wu Frederic's head, you can get the title of Governor of the Sky, and occasionally meet soldiers and salute you.
If you join the storm cloak, you will attack the cities controlled by the empire, but it will also snow ... If you like snow, don't join the storm, then you will have no reputation. . Is to help the storm kill Tullius (the imperial general who tried to cut your head off at first). Then the lords of major cities were locked in dungeons everywhere. . . You can visit them once in a while. . But they will curse you. . . .
Moreover, the empire was well equipped. After all, he is a regular army. .
Hope to adopt