甲こう乙おつつけがたい

expression, i-adjective

hard to tell which is better; little to choose between them

Used when comparing two things of nearly equal quality or merit, making it difficult to decide which is superior. Often appears in formal or written contexts.

• 両りょう者しゃの提てい案あんは甲こう乙おつつけがたい。

  It's hard to say which of the two proposals is better.

• この二ふたつの作さく品ひんは甲こう乙おつつけがたい出で来きだ。

  These two works are so well done that it's difficult to choose between them.