You know, 1992 and 1993 is always a good debate. I think what seperated the two was the fact that Dallas did have more key injuries in 1993 (plus Emmitt's holdout).
I can also understand choosing 1993 as well. Hey, the four games Dallas lost in 1993, Emmitt either not played at all, played only one series of downs in Atlanta, or was used sparingly on the ice-covered turf at Texas Stadium on Thanksgiving.
Had Emmitt not held out, and was injury free, in 1993, Dallas could have been undefeated. Dallas never lost a game when Emmitt played the whole game.