I had this problem come up at a regional final at Chew. In the end it was the most convincing person who won the debate (me on this occasion), although this was a little tricky to maintain when we motored in the opposite direction to just about everyone else. When we finished first and second the other chap had no complaints though.
However, at the National at Grafham I bowed to the superior knowledge of Bob Church - guess what - we both blanked.
I would suggest that if you have very good knowledge of the venue that you prepare a convincing / persuasive sales pitch on why you should be the boss. If the other person's sales pitch is even better then I guess you'll be happy to follow that expert's lead. At the end of the day, it's about fishing in the best spots - it doesn't matter who decides on how to get there.