six of one and half-a-dozen of the other
six of one and half-a-dozen of the other {n. phr.}
Two things the same; not a real choice; no difference.
Which coat do you like better, the brown or the blue? It's six of one and half-a-dozen of the other.
Johnny says it's six of one and half-a-dozen of the other whether he does the job tonight or tomorrow night.
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Source: A Dictionary of American Idioms