I was tempted at making a thread like this. Whats strange is that the tone of the green and red sound s bit different, the green has a smoother softer not as harsh high end and more bass as well as looser bass, the red channel can have a harsh brightness and has less bass and what is there is tighter. However IME, those sublties are lost in translation through the mic and the only difference you hear is the tightness or the loosness. When recorded though, the green doens't have an agressive in your face punch or dynamic to it.
my vote though, just like Poid said, blend the green and red.