Which parade are you asking about? Many like Adventureland area for the daytime parade as it starts there. If you arrive early you can get spots in the shade on the side of the street where Pecos Bills is.
to me the 'perfect' location for this parade is looking straight down Main Street towards the castle. Above the train station is normally reserved for VIP but close to the flagpole is great but that spot will be taken very early.
The nighttime parade marches in the opposite direction from park entrance and ends in Adventureland. Not sure of any preferred spots but just a heads up that you do not need to be in the front row to enjoy this parade.