I don't really think either one of them is worth $10 more than the other. So which ever is cheaper.
However this is better than either of them:
NZXT Hale82 650W ($60 @ Amazon)http://pcpartpicker.com/part/nzxt-power-supply-hale82650m
This is a rebranded Seasonic M12II 650W (SS-650AM), which is superior to the M12II Bronze up to 620W. However the minimum speed of it's 12cm fan is 1000RPM, so the down side is that it is not that quiet.