Well, Renee, let me first wish you the best of luck in your new and addicting hobby! Once you get that first call to the awards stage, you're a goner!
Looks like you will be cooking on a BGE which is a great cooker for chicken! The judges these days are HUGE on "bite-through" skin, which is to say, CRISPY, not rubbery.
As you probably know, the way to get crispy skin is to cook hot and fast, rather than low and slow.
Now, historically, judges have wanted chicken that has fairly traditional BBQ sauce, i.e., KC style - red, sweet, with heat. The trick is to sauce the chicken, yet not have rubbery skin. I have yet to master that!
Thighs have traditionally done well, since they don't dry out as quickly as breasts do. You do not get "bonus points" for submitting breast meat, but if you are successful in cooking excellent product, you may win over judges who are fans of white meat.
Skin traditionally has done better than no-skin, since it looks prettier.
Trends in what does well at BBQ contests are always changing, but these have been my experiences.
Again, good luck! What's your team name? You competing at Lakeland?
Lee