Brown or tan gives you the best all-around performance. They're dark enough to use in bright sun, but also perform well on overcast days. Gray is best for bright sun and gives true color resolution, but they're not great for overcast conditions. Brown doesn't distort color all that much, either.
If you have the bucks, tho, the "Backwater Green" lenses on Ocean Waves are the best I've ever used.
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