I prefer my sunglasses with gray tint (no color distortion) and as dark as possible (if I want to diminish light, I want to significantly diminish it). Other necessary features are pretty much standard these days (UV blocking and polarized). I don't care for the wraparound style because it requires a 4 inch deep case to store them in because they don't fold anywhere near flat. However, when being worn the wraparound style provides more protection.

It's a moot point for me anyways - because people like me who wear glasses normally are very limited in the prescription sunglasses styles available.