lets look at the 13 weeks....
week 1 A game- Washington/Rutgers. B game- Ohio St/Indiana. Not much of a difference.
week 2 A game- Ohio St/Oklahoma. B game- Penn St/Pittsburgh. ESPN week. Huge advantage ESPN
week 3 A game- Army/Ohio St. B game- Air Force/Michigan. not much of a difference(likely #13 week)
week 4 A game- Notre Dame/Mich St B game- Penn St/Iowa. Fox week. Advantage Fox- but not huge.
week 5 A game- Mich St/Iowa B game- Wisconsin/Northwestern. not much of a difference
week 6 A game- Mich St/Michigan B game- Wisconsin/Nebraska. slight difference.
week 7 A game- Ohio St/Nebraska. B Game- Mich St/Minnesota. Huge difference.
week 8 A game- Michigan/Penn St B Game- Iowa/Northwestern. ESPN week. Huge advantage ESPN
week 9 A game- Penn St/Ohio St B game- Mich St/Northwestern. Fox week. Huge advantage Fox
week 10 A game- Penn St/Mich St B Game- Ohio St/Iowa. not much of a difference.
week 11 A game- Mich St/Ohio St B game- Iowa/Wisconsin. big difference
week 12 A game- Michigan/Wisconsin B game- Nebraska/Penn St. Not much of a difference.
week 13 A game- Ohio St/Michigan B game- Iowa/Nebraska. Fox week. Huge advantage Fox.

so far Fox has 2 weeks with huge advantages. ESPN has 2, with the next choice. Fox's 3rd choice is an advantage, but not that big.