"2014 team had a slightly better SRS, yards per play, and a much greater point differential. The 1999 team allowed much fewer yards per play from their competition and had several higher quality wins. If these two teams were to play, the media would hype up Cato versus Pennington, but the real deciding factor would be the 2014 offense versus the 1999 defense, two juggernaut forces that would be in for a tremendous challenge against one another.
If I was forced to pick a winner based on numbers, I would give a slight edge to the 2014 team, but the game really could go either way, and I certainly would not feel confident betting any money on the outcome. Also, I’m not completely ready to write off the 2002 team in this hypothetical match, as I feel the statistics unfairly represent them for at times playing down to their opponents."
According to the end result using numbers, 2014 wins.
But, if you want to put things into other perspectives...
1999 team doesn't finish in the top 10 nationally with the 2014 ranking system including the CFP.