As if there was any doubt on which side of this question I come down on, my vote is for sinaloans. As already said, they tend to have very little tipping stay bright red and have low band counts. All that equals on of the most impressive milksnakes. Plus, I have found my older ones are not too afraid of being out in a cage that is set up well. By that I mean complex hiding places that are changed around a lot. Keeps them active.
To show them off (and make Dniles a little jealous)........
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“There is a grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one; and that whilst this planet has gone on cycling according to the fixed laws of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved.” -C. Darwin, 1859
Natural Selection Reptiles