In addition to opening one hour earlier than the rest of the stadium parking, the green lot is also the only lot that does not use directional parking. This means you can park wherever you like and save a spot for your friend’s car if he’s arriving an hour or two later. The rest of the stadium has an attendant telling you exactly which spot to park in and only allows you to tailgate with your friends if you enter the lot right behind each other.
In my opinion, the green lot is by far the best of the bunch.