Need to get a fresh pair of goggles for this season, and I have worked it down to the the Smith I/O and Anon M1. I have enough cash for both, but can get the Smiths for 30 bucks less. I have a medium shaped head and a Bern helmet (baker i think). Both goggles come with 2 lenses. Any pro's and con's of either? Which would you go with?