In my opinion the Confederacy's is the best.
Feel free to share your opinions below.
(And yes I excluded the Old Republic and Sith Empire.)
Edit 1: Have you guys have even listened the Confederacy theme? (This goes to the people who voted empire.)
Edit 2: I just realized that I spelled alliance wrong, autocorrection is a bitch.
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Edited by EwCringe: 12/7/2015 1:49:37 AMEither the Republic or the Rebels. I voted the Republic because it fits the scene at the end of the Clone Wars perfectly (loading the carriers). But the beginning of the Rebels theme (in the video) is also awesome.