Neutral seems the most likely way the game is supposed to unfold. Plus it makes the best story with regards to the Triss character.But between the two sides, it's definitly the Order. Sigfried is a pretty good guy. Yaevin is an arrogant hypocrit who wants to burn the city to the ground. Also, the story comes out rather flat when you side with the rebels, IMO. Plus , the knights look way cooler. Especially the guy with the red plates on his shoulders.