In the Big 12 I'd say A&M had a 20% chance of playing the title game each year and a 10% chance of winning the conference. In the SEC there is no chance they have over a 10% chance of winning the conference or even getting to the title game in any given year. They will lose at least two games playing an SEC schedule each year and in most years they will lose 3 or 4 conference games.
The only reason at this point that they have a better chance in the Big 12 is because we only have 10 teams to their 12 teams. That's it.
All A&M has to do is make the title game 1 time in 10 years in the SEC and that is more times than they have in the Big 12 the last 10 years.