While I personally like a vinegar sauce, there are many who do not. I would stay away from a vinegar sauce for competition. Remember, you are cooking for the judges. Here is an example; a few/couple of years ago, I was a table captain at a contest. There was a pork entry with a vinegar sauce. I tasted it and thought it was great. I would have given it 999. There was one judge at the table who did give it 999. The rest of the judges scored it as low as 5 on taste. After judging, I took the box back to the grazing table. My wife was working the turn in table and asked me if I had anything good she should try. I pointed out the vinegar sauced pork. She tried it and spit it out! Where I liked it and thought is was an excellent entry, she hated it. If she had been judging it might have been lucky to get a 3 on taste. As I said, stay away from the vinegar sauce for comps. A vinegar sauce is just too drastic/strong taste to take a chance at comps.