I say Chester County just because I have seen how hard the guys have worked and how badly they want to make it to playoffs.
As far as Bolivar making us "miserable," I think the score this week will be much closer than, say, the Fayette-Ware or Middleton games were. Even if we lose, these boys will put up such a fight that they will NOT be coming home miserable. They will play hard and play fair, and they will be able to hold their heads up either way.
(I'm guessing you're a mom that's bitter about TCA losing to a team that they whipped last year? All I have to say is the Eagles were a better team this year, and you as a parent need to get over it and go support the TCA boys in the play-offs. That's just how sports go.)