all (the) one
1. The same as other options. Voting for a democrat or a republican for president is all one in my opinion; they're both going to lead the country the same way.
2. Making no difference or of no consequence to someone. To be honest, I don't care if we buy the blue or the red sofa; it's all the one to me.
all one
Of no difference; immaterial: Whether we go out or stay in, it's all one to me.