When it comes to sunglasses, it seems to always come down to Raybans and Oakleys. Perhaps those vampire commercials of the 90s did a nice job advertising for Rayban.
As to what sunglasses I wear, I usually don't care for them. However, when I'm driving, I need something that'll reduce glare occasionally, so I keep some of those polarized clip-ons to go over my regular glasses. Makes me feel super nerdy but hey, they work fine.