Gray C is the best overall solution for deep water fishing dealing with intense glare and bright sunlight.

Melanin provides a very effective polarized filter to cut through water glare.  Improves contrast so that fish can be easily seen in shallow water streams.

Brown C is a good choice for fishing and as an all-purpose sunglass.  Has a very effective polarizer and will make some improvement of contrast.

Brown A has the benefits of Brown C but is more useful in low light situations.

Orange is best used for fishing in overcast or low light situations.  Has a moderately effective polarizer.  Increases contrast.

Yellow can be effective in highly overcast or low light.  Yellow has the least effective polarizer, so it is not recommended for high glare situations.