2009 Bama: Undefeated, beat 4 top ten teams, 6 top 25 teams, escaped against Tennessee
2012 Bama: One loss, beat 4 top ten teams, 5 top 25 teams, escaped against LSU
In my opinion the one loss at home to a non top-10 A&M and the close call against Georgia makes the 2012 team the weakest of the teams. I also think the 2011 team was the strongest despite their one loss. They absolutely rolled everyone (a weaker schedule than 09 or 12) except LSU the first time, but destroyed them the second time. I rank them 2011, 2012, 2009. However, we are talking degrees of greatness here and this is very debatable stuff. Would not be hard to make a case any which way you want.