for real sun, and daylight riding, I keep going back to my raybans. I have a pair of tifosis for lowlight conditions, but their dark lens is poor compared to the raybans. Raybans have excellent optical quality. I kinda like the really techy glasses like Oakleys, but I think they are frightfully overpriced. I also don't like the no bottom frame quality of the zoomy looking sunglasses, too much like safety glasses for my taste.
Whatever you get, if it is for sun, you will be much happier with their performance if you get polarized lenses, that is worth every extra penny.

Unfortunately the raybans aren't dogproof; I will have to replace mine this season because the beast chewed them a bit.