jmill88, tell me a little about the competition. Sanctioned or not? What sanctioning body?
Unsanctioned most anything goes and it's a crap shoot. If you sauce, make darned sure that the sauce that you use goes very well with the rub. I cannot tell you how many times (like 80% of the time) I sample barbecue where the sauce flavors conflict with the injection or rubs.
I see you're in MO. I doubt it's MBN, but if it is they allow sauce on the side; multiples. I would do that. It gives the judges the option of how much sauce to use and which sauce to use.
If sanctioned, research the sanctioning body and see if they allow sauce on the side. if so, do that. If they allow 2, then present 2. Choices are generally a good thing, as long as the sauce goes.
Know that the sauce should compliment the flavors of the meat, not overpower it. That's another mistake many newer teams make; the only flavor is in the sauce. The smart judge will pick-up on this and even with a great sauce you'll be scored down.
Best of luck!