Ok, lets look at the numbers:
Lexington- 3-0 106 points scored, 19 points allowed
Won week 1 against Tipton 35-0
Won week 2 against Trenton 20-19
Won week 3 against Northeast Law 51-0
Combined opponents record 4-5
Wellington Napoleon- 3-0 134 points scored, 50 points allowed
Won week 1 against Lone Jack 50-16
Won week 2 against West Platte 42-22
Won week 3 against Santa Fe 42-12
Combined opponents record 3-6
You have two undefeated teams. One from Class 2, the other from Class 1. While Lexington has played slightly better opponents, Wellington Napoleon has been handling teams in its game, which is something good teams do. Lexington won this game last year 56-34 in Wellington Napoleon. This year Lexington is hosting, has not played down to inferior opponents, while beating a solid team. I would go with Lexington. Lexington 47 Wellington Napoleon 35