I have 3 pair of sunglasses, depending on the weather and lighting. The first two pair are some decent quality polarized lenses, one with a dark grey lens, the other with a moderatly dark brown/amber lense. I use them on bright days with the sun in front or behind me (grey for in front, brown when behind).

For other lighting, I have a pair of Native glasses with changeable lenses, and again I switch out the lens based on the weather, usually polarized dark rose, or an orange that really helps on cloudy days by enhancing contrast.

In general, I find polarization is really good for bright skys.