It is a tough call for me. 2009 felt like a huge sigh of relief for me, after 17 years, the Dubose, Fran, Price and Shula era, we were finally back on top. There were times between 2000-2006 where I felt we may never get there again in my lifetime. I remember walking out of Bryant Denny Stadium after that loss to Miss St in 2006 and the thought of winning a title in just 3 years was the furthest thing from my mind.
2009 was a really special season, winning a Heisman, beating Florida after being oh so close in 2008 and going undefeated. But at the same time 2011 was great because of it seemed like any chance we had was gone right after the LSU loss in November. Then all of the drama leading up to the final to the BCS selection show with Boise St, Ok St, Oregon, Stanford all going down. It was a lot of fun to beat LSU basically in their own backyard to win that title.
Both have different meaning to me, but I consider them both equal in my book.