I read an article about this a few days ago and thought it might be fun to get some opinions. I'll say the SECCG.
And the new Bama Tax that sports books are using. That is an additional 4 points.No way of knowing the score at the end of three, but here is Pigskin Index computer rankings which, unlike some, has the actual point spread built into the ranking. Looking ahead this is our closest games: Alabama over LSU by 17. Alabama over Auburn by 15. Alabama over Georgia by 7. So I will say Georgia.
So far this year the Vegas spread as pretty much mirrored the three computers I use. Vegas seems to like the computers. Here is the link and the future point spreads are at the bottom of the pages. I didn't apply the home field advantage of 3 pts.
http://powerratings.com/cfootball.htm