どちらのチームが

which team

→ どちら
phrase Rare #36,013
which team Used to ask which of two teams is the subject of the sentence; が marks the subject.
JA: どちらのチームが優勝すると思いますか。
EN: Which team do you think will win the championship?

どちらのチームが勝つかわからない。

I don't know which team will win.

どちらのチームが勝ちそうですか。

Which team is more likely to win?

どちらのチームがその試合に勝つかはどうでもよい。

It doesn't matter which team wins the game.