兄けいたり難がたく弟ていたり難がたし

expression

both are equally excellent; hard to say which is better

Classical idiomatic expression used when two people are so outstanding that it is difficult to rank one above the other. Often used in literary or formal contexts.

• 彼かれらはまさに兄けいたり難がたく弟ていたり難がたしの名めい勝しょう負ぶを繰くり広ひろげた。

  They put on a magnificent match where it was truly hard to say which was better.

• この二人ふたりの作さっ家かは兄けいたり難がたく弟ていたり難がたしで、どちらが優すぐれているとは言いえない。

  These two writers are both so superb that it's impossible to say which is superior.