Well it's not often a team scores 48+ points per game and wins the national championship. Plus, thanks to the playoff and the SECCG opponent, you could argue no one ended a season better, so they finished with an uptick.
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2013 FSU had better scoring and scoring prevention numbers. They destroyed everyone until Auburn in the NCG. I'd take them over '19 LSU. But the juiciest matchup of '19 LSU vs a champion from the past 10 years would definitely be 2011 Alabama. Perhaps the best pass defense of all time AND they didn't allow rushing yards. It would just be fun to watch.
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8-team tournament (based on season instead of seedings):
19 LSU (Burrow) vs 12 Alabama (Lacy/Yeldon) winner
vs
16 Clemson (Watson) vs 15 Alabama (Henry) winner
.
17 Alabama (Hurts/Tua) vs 14 Ohio St (Elliott)
vs
18 Clemson (Lawrence) vs 13 FSU (Winston)