six of one and half a dozen of the other, phr.
There's no difference between two choices. Note that dozen means “twelve,” so six and half a dozen are the same in number: six. (Also for dozen: two dozen (24), three dozen (36), etc.) Colloquial.
• You can take either highway and still get there in an hour. It’s six of one and half a dozen of the other.
• I have no opinions on this. It’s six of one to me.
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