two things the same, no difference It was six of one or half-a-dozen of the other as to whether or not we should take the train or the airplane. They both arrived at the same time and cost the same.
SIX OF ONE AND HALF-A-DOZEN OF THE OTHER
Meaning of SIX OF ONE AND HALF-A-DOZEN OF THE OTHER in English
English idioms vocab. Словарь английских идиом и выражений. 2012