[Travis C.]

I don't know about the harpeth but on the Caney my copper lens seems to be much better than my gray lens.

You may not get the same results out of all those three places with the same lens color. Light conditions and water clarity play a big role in which type you may need.

Other than just worrying about a color you'll need to consider weight of frame, glass or plastic lens and don't forget where the ear pieces meet the frame at the hinge. The better they wrap your face or the wider the ear pieces are at the hinge equals more light blocked from coming in the side. That increases visibility too.