On the bike and on foot
What matters is coverage, weight and a fit that doesn't move. Tour, Giro and Sprint use a half frame that leaves the lower edge of the lens open, so the road stays in view when you're low on the bars, and all three carry a water-repellent coating for rain and sweat. Killy wraps around the face on a flexible TR-90 frame and works as well for running as for riding.
For long climbs and high passes, Summit and Ridge add wide shield lenses with removable side panels. Every lens here is polarized; most are category 3, and Summit and Ridge also come photochromic. For the details, read How to choose cycling sunglasses.