If my team weren't involved I would probably say, "OSU is from a major conference and is undefeated, so you have to take them over any 1-loss team".
But in my mind I think Auburn is better, so if I were a voter I'd probably vote that way. I think that argument will be buttressed by the fact that even if OSU wins, Auburn is going to come out ahead of them in some rankings or it will be pretty darn close because they played a much tougher schedule. Missouri probably doesn't have that card in our back pocket, we won't have as strong of a ranking as Auburn would if we end up winning.
I think Auburn controls their destiny, but Mizzou would probably need an OSU loss.